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B1 noun #7,000 most common 9 min read

老化

Top 7,000

Practice it Examples Notes & Tips 老化 in 30 Seconds

Explanation 老化 in your Level:

At the A1 level, you don't need to use '老化' (rōka) frequently. It is a more advanced word. Instead, you usually learn 'おじいさん' (grandfather/old man) or 'おばあさん' (grandmother/old woman). You might learn the adjective '古い' (furui) for old things. If you want to say someone is old, you might say '年をとっています' (toshi o totte imasu), which means 'they have taken years.' '老化' is much more formal and scientific than what you would normally use in basic greetings or simple introductions. However, you might see the kanji '老' (old) in words like '老人' (old person), which is a good first step to understanding the root of '老化.' Just remember: '老化' is about the *process* of getting old, not just being an old person.

At the A2 level, you are starting to talk about health and daily life. You might encounter '老化' in simple health tips or when talking about why someone's health is changing. You should understand that '老化' refers to the body getting older. For example, '老化を防ぐために野菜を食べます' (I eat vegetables to prevent aging). At this stage, it's important to differentiate between '老化' (the biological process) and '年をとる' (the act of having a birthday or getting chronologically older). You will likely see '老化' in advertisements for skin cream or vitamins. Try to recognize the kanji: 老 (old) and 化 (to change). It literally means 'changing into an old state.'

At the B1 level, '老化' (rōka) is a key vocabulary word for discussing social issues, health, and science. You should be able to use it as both a noun ('老化の原因' - cause of aging) and a suru-verb ('細胞が老化する' - cells age). You are expected to understand its role in Japan's 'Super-Aging Society' (超高齢社会) discussions. You should also be aware of common collocations like '老化現象' (aging phenomenon) and '老化防止' (anti-aging). At this level, you should start being careful not to use '老化' for buildings or machines, as that is a common intermediate-level mistake. Instead, you'll start learning terms like '老朽化' for infrastructure. B1 learners should feel comfortable reading '老化' in news articles about health and medicine.

At the B2 level, you should have a nuanced understanding of '老化.' You can distinguish it from '加齢' (karei), which is a more neutral term for adding years. You should be able to discuss the biological theories of aging or the economic impact of an aging population using this word. You might encounter it in technical contexts, such as '血管の老化' (aging of blood vessels) or '脳の老化' (brain aging). Your usage should be precise—you know that '老化' is often an intransitive process (something ages) but can be used transitively in the causative form ('紫外線を浴びることは肌を老化させる' - bathing in UV rays makes the skin age). You are also familiar with related kanji compounds like '不老長寿' (perpetual youth and longevity).

At the C1 level, '老化' is a tool for academic and professional discourse. You understand its implications in gerontology (老年学), sociology, and biology. You can use it to describe abstract concepts, like the '老化' of a political system (metaphorically, though '硬直化' might be more common, '老化' can be used for a system losing its vitality). You are expected to know the subtle differences between '老化' and '衰退' (decline) or '退化' (degeneration). In a professional medical or scientific setting, you can discuss '老化関連疾患' (age-related diseases) with ease. You also understand the cultural weight of the word in a country like Japan, where the 'aging' of the population is a central pillar of government policy and national identity.

At the C2 level, your command of '老化' is indistinguishable from a native speaker. You can use it in highly specialized scientific papers or in deep philosophical discussions about the nature of mortality and time. You understand the literary use of '老化' to evoke a sense of 'mono no aware' (the pathos of things) or 'wabi-sabi' (beauty in imperfection and age). You can navigate the most complex grammatical structures involving the word and can identify when it is used ironically or metaphorically in high-level literature. You are also fully aware of the legal and ethical discussions surrounding '老化,' such as anti-aging research and the definition of aging as a 'disease' in modern medical philosophy.

Practice it Examples Notes & Tips

老化 in 30 Seconds

Refers specifically to biological aging and physical decline in living organisms.
Used as a noun or a suru-verb (老化する) in medical and health contexts.
Commonly paired with 'prevention' (防止) or 'phenomenon' (現象) in Japanese media.
Should not be used for inanimate objects; use 'rōkyūka' for buildings instead.

The Japanese word 老化 (ろうか - rōka) is a fundamental noun and suru-verb used to describe the biological process of aging or senescence. In its most literal sense, it combines the kanji 老 (old) and 化 (change/transformation), perfectly encapsulating the concept of 'becoming old.' While in English we might use 'aging' for everything from cheese to people, in Japanese, rōka is specifically reserved for the physiological decline of living organisms or the deterioration of biological functions over time. It is a word that carries a clinical, scientific, or observational weight, often appearing in medical discussions, skincare advertisements, and social studies regarding Japan's demographic shifts. When you see this word, think of the cellular level—the slowing down of metabolism, the appearance of wrinkles, or the decline in physical strength. It is not merely about the passage of calendar years, but about the physical manifestations of that passage.

Biological Context: Refers to the progressive deterioration of metabolic processes and cellular function. Example: 脳の老化 (brain aging).

Cosmetic Context: Frequently used in 'anti-aging' (アンチエイジング) marketing to describe skin changes like wrinkles or loss of elasticity. Example: 肌の老化を防ぐ (preventing skin aging).

Societal Context: Used to discuss the aging population, though '高齢化' (kōreika) is more specific to demographics, '老化' is used for the individual experience. Example: 老化現象 (aging phenomena).

人間は誰でも避けることができない老化という過程を辿ります。

Translation: Every human follows the unavoidable process called aging.

適度な運動は、体の老化を遅らせる効果があります。

Translation: Moderate exercise is effective in delaying the body's aging.

最近、物忘れが激しいのは老化のサインかもしれない。

Translation: The recent severe forgetfulness might be a sign of aging.

紫外線を浴びすぎると、皮膚の老化が早まります。

Translation: Overexposure to UV rays accelerates skin aging.

彼は老化に伴う視力の低下に悩んでいる。

Translation: He is suffering from declining eyesight associated with aging.

In a cultural context, Japan is often referred to as a 'Super-Aging Society' (超高齢社会). While kōreika describes the statistical trend, rōka describes what is happening to the people within that trend. Understanding rōka involves recognizing it as a natural, albeit often resisted, part of life. In Japanese literature and daily conversation, it is often paired with words like 'prevention' (防止 - bōshi) or 'phenomenon' (現象 - genshō). It is important to distinguish it from 'getting older' (歳をとる - toshi o toru), which is a more general and neutral phrase for birthdays and time passing. Rōka is the biological reality, while toshi o toru is the social and chronological reality.

Using 老化 (rōka) correctly requires understanding its grammatical flexibility as both a noun and a verb. As a noun, it often acts as the subject or object of a sentence, frequently modified by possessives like 'skin's' or 'brain's.' As a verb, it combines with 'suru' (老化する) to describe the act of aging itself. It is crucial to note that rōka is generally used in a serious or objective tone. If you are joking with a friend about getting older because you can't stay up late anymore, you might use 'rōka' for comedic effect, but 'toshi da ne' (it's age, isn't it) is more common for casual banter. In academic writing, rōka is the standard term for senescence.

As a Subject: 老化は避けられない。 (Aging is unavoidable.) Here, it stands as the abstract concept of biological decline.

As a Verb (老化する): 細胞が老化する。 (Cells age.) This describes the process happening in real-time or as a scientific fact.

With Compound Nouns: 老化現象 (Aging phenomenon), 老化防止 (Anti-aging), 老化対策 (Countermeasures against aging).

When constructing sentences, consider the 'speed' of aging. You will often see verbs like 'susumu' (proceed/advance) or 'osomeru' (delay). For example, '老化が進む' (aging is advancing) is a very common way to describe someone showing more signs of age than before. Conversely, '老化を食い止める' (to hold back aging) is used in more dramatic or medical contexts. In the skincare industry, you'll see 'エイジングケア' (aging care), which is a softer, katakana-based alternative to the more clinical '老化防止'. This distinction is important for learners: 'rōka' sounds like a biological reality, while 'aging' (in katakana) sounds like a lifestyle or beauty choice.

ストレスは老化を早める大きな要因の一つです。

Translation: Stress is one of the major factors that accelerate aging.

抗酸化物質を多く含む食品は、老化の抑制に役立ちます。

Translation: Foods rich in antioxidants are helpful in suppressing aging.

最近、膝の痛みを感じるのは、関節の老化が原因かもしれない。

Translation: Feeling knee pain recently might be caused by the aging of the joints.

You will encounter 老化 (rōka) in several specific domains in Japanese society. Perhaps the most frequent is in the media and news, where Japan's status as a 'Super-Aging Society' is a constant topic of debate. Journalists use rōka to discuss the health of the elderly population and the medical costs associated with biological decline. You will also hear it in every pharmacy and department store beauty counter. The Japanese beauty market is obsessed with 'anti-aging,' and while the loanword 'anti-aging' (アンチエイジング) is used for marketing, the back-of-the-bottle descriptions and clinical explanations will invariably use rōka to explain what the product is actually doing for your skin cells.

News & Documentaries: Discussing 'social aging' and the physical health of the workforce. Phrases like '老化に伴う社会保障費の増大' (Increasing social security costs due to aging) are common.

Medical Settings: Doctors explaining age-related conditions. They might say 'これは老化によるものです' (This is due to aging) to explain why a patient's hearing or sight is declining.

Gyms & Health Clubs: Promoting exercise as a way to fight 'physical aging' (体の老化). Trainers might focus on '血管の老化' (aging of blood vessels) as a key health metric.

In everyday life, you might hear a friend say, '最近、老化を感じるよ' (Lately, I feel like I'm aging) after struggling to remember a name or getting tired more easily. This is a very common, slightly self-deprecating way to acknowledge the passage of time. However, be careful not to use it towards someone else unless you are very close or in a clinical setting, as pointing out someone's 'rōka' can be seen as quite blunt or even offensive. It's much more polite to use euphemisms or focus on 'getting older' (お年を召す - otoshi o mesu) in formal social situations.

テレビ番組で、老化を防ぐための食事法が紹介されていた。

Translation: On a TV program, dietary methods to prevent aging were introduced.

化粧品のラベルに「老化サインにアプローチする」と書いてある。

Translation: The cosmetic label says "approaches signs of aging."

One of the most common mistakes for English speakers is using 老化 (rōka) for things that are not biological. In English, we say 'the aging of the building' or 'the aging of the wine.' In Japanese, using rōka for a building would sound very strange, as if the building had cells and DNA. For infrastructure, buildings, or machines, the correct term is 老朽化 (rōkyūka). For wine or cheese, the term is 熟成 (jukusei), which means aging in the sense of 'maturation' or 'ripening.' Using the wrong word here is a clear marker of a non-native speaker.

Mistake: Aging Objects: Incorrect: この建物の老化が進んでいる。 (The building is aging.)
Correct: この建物の老朽化が進んでいる。

Mistake: Aging Food: Incorrect: ワインの老化。 (Aging of wine.)
Correct: ワインの熟成。

Another mistake is confusing rōka with kōreika (高齢化). While related, kōreika specifically refers to the demographic trend of a society having more elderly people. You cannot say a person is 'kōreika-ing.' A person 'rōka-shiteiru' (is aging biologically) or 'toshi o totteiru' (is getting older chronologically). Additionally, avoid using rōka when you mean 'growing up' or 'maturing' as a person. For a child growing into an adult, use seichō (成長). Rōka is almost always associated with the decline phase of the life cycle, not the growth phase.

間違いやすい例：橋の老化（×）→ 橋の老朽化（○）

Note: Use 'rōkyūka' for infrastructure like bridges.

間違いやすい例：子供の老化（×）→ 子供の成長（○）

Note: Children 'grow' (seichō), they don't 'rōka'.

Japanese has many words for 'aging' depending on the nuance and the object being described. 老化 (rōka) is the most clinical and biological. If you want to sound more natural in a social setting, or if you are talking about someone with respect, you should choose your words carefully. Understanding these nuances is key to reaching a B2/C1 level of fluency.

加齢 (かれい - Karei): Meaning: Adding years. This is a more neutral, less negative term than 'rōka.' It implies the natural progression of time rather than just biological decline. Used often in polite health contexts.

衰え (おとろえ - Otoe): Meaning: Decline/Weakening. This is used for specific functions, like 'memory decline' (記憶力の衰え) or 'physical decline' (体力の衰え). It is more descriptive of the results of aging.

老朽化 (ろうきゅうか - Rōkyūka): Meaning: Deterioration of infrastructure. As mentioned, this is for buildings, pipes, and roads. It implies that something is becoming old and potentially dangerous or unusable.

熟成 (じゅくせい - Jukusei): Meaning: Maturation. This is for food and drink (wine, meat, cheese) and sometimes metaphorically for skills or ideas that have 'ripened' over time.

When deciding which to use, ask yourself: Is it a person? (Use rōka or karei). Is it a building? (Use rōkyūka). Is it a positive maturation? (Use jukusei). If you are talking about your own body and want to sound a bit more scientific or objective, rōka is perfect. If you want to be more gentle about the passage of time, karei is the better choice. In medical forms, you will see '加齢に伴う' (associated with aging) very frequently as a standard phrase.

比較：老化（生物的） vs 加齢（時間的） vs 老朽化（物質的）

Comparison of different 'aging' terms.

How Formal Is It?

Fun Fact

The kanji for 'old' (老) originally depicted an old person with long hair leaning on a cane. The '化' part originally showed one person upright and one person upside down, representing change or transformation.

Pronunciation Guide

UK rəʊkə

US roʊkə

In Japanese, the pitch is High-Low (RO-ka).

Rhymes With

こうか (kōka - effect) ほうか (hōka - arson) きょうか (kyōka - strengthening) どっか (dokka - somewhere) ちょうか (chōka - excess) りょうか (ryōka - good/bad) なっか (nakka - falling) はっか (hakka - mint)

Common Errors

Pronouncing 'r' like an English 'r' (it should be a flick of the tongue like a soft 'd').
Making the 'o' too short (it is a long vowel: ろうか).
Confusing it with 'roka' (filtration).
Stressing the second syllable.
Misreading the kanji as 'ro-ke'.

Difficulty Rating

Reading 3/5

Kanji are common but require intermediate knowledge.

Writing 4/5

Writing '老' and '化' is easy, but using it correctly takes practice.

Speaking 3/5

Pronunciation is simple, but formality must be managed.

Listening 2/5

Very common in news and commercials, easy to pick out.

What to Learn Next

Prerequisites

古い年体変化病気

Learn Next

老朽化加齢衰退寿命成熟

Advanced

活性酸素エピジェネティクス長寿遺伝子認知症更年期

Grammar to Know

Noun + する (Suru-verbs)

老化する (to age)

〜に伴って (Along with)

老化に伴って体力が落ちる。

〜による (Due to/By)

老化による記憶力の低下。

〜を防ぐ (To prevent)

老化を防ぐ。

Causative Form (〜させる)

老化させる (to make something age).

Examples by Level

おじいさんは老化しています。

Grandfather is aging.

Simple noun + suru-verb.

老化は怖くないです。

Aging is not scary.

Noun as a subject.

これは老化のサインです。

This is a sign of aging.

Possessive particle 'no'.

老化を止めたいです。

I want to stop aging.

Object marker 'o' + verb 'tomitai'.

母は老化が気になります。

My mother is worried about aging.

Phrase 'ga ki ni naru'.

老化は自然なことです。

Aging is a natural thing.

Descriptive sentence.

老化で耳が遠くなりました。

My hearing became poor due to aging.

Particle 'de' indicating cause.

老化について勉強します。

I will study about aging.

Phrase 'ni tsuite'.

野菜を食べると老化を防げます。

Eating vegetables can prevent aging.

Potential verb form 'fusegeru'.

最近、老化現象を感じます。

Lately, I feel aging phenomena.

Compound noun '老化現象'.

老化は20代から始まります。

Aging starts from one's 20s.

Particle 'kara' for starting point.

紫外線を浴びると老化が進みます。

If you are exposed to UV rays, aging advances.

Conditional 'to' + verb 'susumu'.

老化防止のクリームを買いました。

I bought an anti-aging cream.

Compound noun '老化防止'.

運動は老化を遅らせます。

Exercise delays aging.

Transitive verb 'okuraseru'.

脳の老化をチェックしましょう。

Let's check the aging of the brain.

Volitional 'mashō'.

老化で筋肉が弱くなります。

Muscles become weak due to aging.

Particle 'de' for reason.

老化は生物にとって避けられないプロセスです。

Aging is an unavoidable process for living things.

Formal copula 'desu'.

日本は老化が社会問題になっています。

In Japan, aging has become a social problem.

Contextual usage for society.

ストレスが老化を加速させることがわかった。

It was found that stress accelerates aging.

Causative 'kasoku saseru'.

老化に伴って、記憶力が低下する。

Memory declines along with aging.

Grammar 'ni tomonatte' (along with).

このサプリメントは老化対策に効果的だ。

This supplement is effective as a countermeasure against aging.

Compound '老化対策'.

老化の研究は日々進歩している。

Research on aging is progressing every day.

Noun modification.

肌の老化は、乾燥が主な原因です。

The main cause of skin aging is dryness.

Subject marker 'wa'.

老化をポジティブに捉えることが大切だ。

It is important to perceive aging positively.

Adverbial 'positive ni'.

細胞の老化を遅らせる遺伝子が発見された。

A gene that delays cellular aging was discovered.

Passive voice 'hakken sareta'.

老化現象のメカニズムを解明する。

To clarify the mechanism of aging phenomena.

Direct object with 'o'.

老化による視力低下は、手術で改善できる場合がある。

Vision loss due to aging can sometimes be improved with surgery.

Potential 'kaizen dekiru'.

彼は老化を恐れ、過度な食事制限をしている。

He fears aging and is doing excessive dietary restrictions.

Te-form for reason.

抗酸化作用のある食品は老化抑制に役立つ。

Foods with antioxidant effects are useful for suppressing aging.

Relative clause.

老化は単なる衰えではなく、新しい段階への移行だ。

Aging is not just decline, but a transition to a new stage.

Contrast 'dewa naku'.

老化のスピードには個人差がある。

There are individual differences in the speed of aging.

Noun 'kojinsa' (individual differences).

過度な飲酒は、臓器の老化を早める原因となる。

Excessive drinking causes the aging of organs to accelerate.

Resultative 'gen'in to naru'.

老化を「病気」と定義する新しい考え方が広まっている。

A new way of thinking that defines aging as a 'disease' is spreading.

Quotative 'to' + 'teigi suru'.

精神的な若さを保つことが、肉体の老化を遅らせる鍵となる。

Keeping mental youth is the key to delaying physical aging.

Nominalized clause 'koto'.

老化に伴う認知機能の低下をいかに防ぐかが課題だ。

How to prevent the decline of cognitive function associated with aging is the challenge.

Interrogative + 'ka' as a subject.

現代社会において、老化は克服すべき課題と見なされている。

In modern society, aging is seen as a challenge to be overcome.

Passive 'mi nasarete iru'.

老化細胞を取り除く技術が、寿命を延ばす可能性を秘めている。

Technology to remove senescent cells holds the potential to extend lifespan.

Relative clause modifying 'gijutsu'.

老化は遺伝的要因と環境的要因の複雑な相互作用である。

Aging is a complex interaction of genetic and environmental factors.

Formal definition structure.

少子高齢化は、社会全体の老化とも言える現象だ。

The declining birthrate and aging population is a phenomenon that could be called the aging of society as a whole.

Quotative 'to mo ieru'.

老化のプロセスを根本から見直す必要がある。

It is necessary to re-examine the aging process from its roots.

Phrase 'konpon kara'.

老化という不可逆的な営みに対して、人類は抗い続けてきた。

Against the irreversible process of aging, humanity has continued to resist.

Literary 'ni taishite'.

細胞の老化は、がん化を防ぐための防御メカニズムでもある。

Cellular senescence is also a defense mechanism to prevent cancer.

Concessive 'mo aru'.

老化を生物学的な不具合として捉えるトランスヒューマニズムの視点。

A transhumanist perspective that views aging as a biological glitch.

Complex noun phrase.

万物の老化は、熱力学第二法則の帰結に他ならない。

The aging of all things is nothing other than the consequence of the second law of thermodynamics.

Idiom 'ni hoka naranai'.

老化の受容は、円熟した人格形成において不可欠な要素である。

Acceptance of aging is an essential element in the formation of a mature personality.

Formal academic tone.

不老不死の探求は、皮肉にも老化の残酷さを際立たせる。

The quest for immortality ironically highlights the cruelty of aging.

Adverbial 'ironically'.

老化の進行を司るエピジェネティックな時計の解明。

The elucidation of the epigenetic clock that governs the progression of aging.

Technical terminology.

社会制度の老化が、イノベーションを阻害しているとの指摘がある。

There are points made that the aging of social systems is hindering innovation.

Quoted 'to no shiteki'.

Common Collocations

老化が進む

老化を防ぐ

老化防止

老化現象

肌の老化

脳の老化

老化に伴う

細胞の老化

血管の老化

老化対策

Common Phrases

老化が気になる

— To be worried about signs of aging.

30代になって老化が気になり始めた。

老化のサイン

— Signs or symptoms of aging.

小じわは老化のサインです。

老化を遅らせる

— To delay the aging process.

健康的な食生活が老化を遅らせる。

老化を加速させる

— To speed up the aging process.

喫煙は老化を加速させる。

老化によるもの

— Something caused by aging.

この痛みは老化によるものです。

老化と戦う

— To fight against aging.

最新の技術で老化と戦う。

老化を抑える

— To suppress or hold back aging.

ポリフェノールは老化を抑える。

老化のメカニズム

— The mechanism/science of aging.

老化のメカニズムはまだ完全には解明されていない。

精神的な老化

— Mental aging or loss of mental vitality.

好奇心を失うと精神的な老化が始まる。

老化を受け入れる

— To accept the process of aging.

老化を受け入れることも大切だ。

Often Confused With

老化 vs 廊下 (ろうか)

Sounds exactly the same but means 'hallway'. Context is key.

老化 vs 老朽化 (ろうきゅうか)

Used for inanimate objects like buildings, while 'rōka' is for living things.

老化 vs 加齢 (かれい)

Neutral term for adding years, whereas 'rōka' implies decline.

Idioms & Expressions

"亀の甲より年の功"

— Wisdom comes with age (literally: the wisdom of years over the shell of a tortoise).

老化は悪いことばかりではない、亀の甲より年の功だ。

Proverb

"老いては子に従え"

— In old age, obey your children.

頑固にならず、老いては子に従えという言葉もある。

Proverb

"不老長寿"

— Perpetual youth and longevity.

昔の王様は不老長寿の薬を探した。

Formal/Idiomatic

"枯れ木に花"

— Like a flower on a withered tree (something wonderful happening in old age).

彼に孫ができたのは、まさに枯れ木に花だ。

Idiomatic

"老いらくの恋"

— Love in one's sunset years.

その小説は老いらくの恋を描いている。

Literary

"老骨を鞭打つ"

— To whip one's old bones (to push oneself despite old age).

老骨を鞭打って、孫のために働いた。

Idiomatic

"一陽来復"

— The return of spring (often used for recovery after a long period of decline).

老化に悩んでいたが、趣味を見つけて一陽来復の心地だ。

Formal

"鶴は千年亀は万年"

— Symbol of longevity (Cranes live 1000 years, turtles 10,000).

老化を恐れず、鶴は千年亀は万年の精神で長生きしよう。

Proverb

"盛りを過ぎる"

— To be past one's prime.

老化を感じ、体力の盛りを過ぎたことを実感した。

Neutral

"年波に勝てない"

— Cannot win against the waves of years (cannot resist aging).

最近疲れやすくて、年波に勝てないと感じる。

Common Idiom

Easily Confused

老化 vs 老朽化

Both translate to 'aging' in English.

'Rōkyūka' is for objects/infrastructure; 'rōka' is for biological organisms.

建物の老朽化 (Building aging) vs 肌の老化 (Skin aging).

老化 vs 加齢

Both refer to getting older.

'Karei' is chronological/neutral; 'rōka' is physiological/decline-focused.

加齢による変化 (Changes with age) vs 老化を防ぐ (Prevent aging).

老化 vs 衰退

Both imply a decline.

'Suitai' is for civilizations, industries, or powers; 'rōka' is for bodies.

帝国の衰退 (Decline of an empire) vs 脳の老化 (Aging of the brain).

老化 vs 退化

Both involve losing function.

'Taika' is evolutionary or due to disuse; 'rōka' is due to time/biology.

器官の退化 (Atrophy of an organ) vs 全身の老化 (General aging).

老化 vs 老衰

Both relate to old age.

'Rōsui' is the extreme end of the process, often the cause of death; 'rōka' is the process itself.

老衰で眠るように逝く (Die of old age) vs 老化を遅らせる (Delay aging).

Sentence Patterns

[Body Part]の老化

肌の老化

老化を[Verb]

老化を防ぐ / 老化を遅らせる

老化が進む

老化が急速に進む。

老化に伴う[Noun]

老化に伴う体力の衰え。

老化による[Noun]

老化による視力の低下。

老化のメカニズム

老化のメカニズムを研究する。

老化対策として〜

老化対策として運動をする。

老化を〜と見なす

老化を自然の摂理と見なす。

Word Family

Nouns

老人 (old person)

老後 (old age/after retirement)

老体 (old body)

老境 (old age/stage of life)

Verbs

老化する (to age)

老ける (to look old)

老いる (to grow old)

老け込む (to age suddenly)

Adjectives

老いた (aged)

老いぼれた (decrepit)

加齢

寿命

アンチエイジング

若返り

健康寿命

How to Use It

frequency

High in medical, health, and beauty contexts; Moderate in daily conversation.

Common Mistakes

Using 老化 for buildings. → 老朽化
Buildings don't have biological cells, so they can't 'rōka.'
Pronouncing it as 'roka' (short o). → rōka (long o)
The 'u' in ろうか makes the 'o' sound long. Short 'roka' means something else.
Using 老化 for a child's birthday. → 年をとる
Children are growing (seichō), not 'aging' in the sense of decline (rōka).
Confusing 老化 with 高齢化. → 高齢化
Kōreika is for society/demographics; rōka is for biology.
Using 老化 for wine maturation. → 熟成
Wine maturation is a positive 'ripening' (jukusei), not a biological decline.

Tips

Living vs. Non-living

Always remember: '老化' is for people/animals/plants. '老朽化' is for buildings/pipes/bridges.

The 'Ka' suffix

The 'ka' (化) in 'rōka' means 'to become'. It's the same 'ka' in 'bunka' (culture) or 'henka' (change).

Softening the blow

If you want to be more polite, use '加齢' (karei) instead of '老化' (rōka) when talking about age-related health.

Kanji components

The top of '老' is a person with long hair. The bottom is a cane. It's a literal picture of an old person.

Super-aging society

Learn the phrase '超高齢社会' (chō kōrei shakai) as it often appears alongside 'rōka' in news articles.

Common collocations

Memorize '老化防止' (anti-aging) as a single unit; it's everywhere in Japan.

Contextual clues

If you hear 'ろうか' and the topic is 'skin' or 'cells,' it's '老化'. If the topic is 'cleaning' or 'walking,' it's '廊下'.

Suru-verb usage

Don't forget you can say '老化する' as a verb. 'My body is aging' = '体が老化している'.

Causative form

Use '老化させる' when something (like the sun) makes you age. 'Sunlight ages the skin.'

JLPT Tip

This word often appears in the 'health' or 'science' section of intermediate Japanese tests.

Memorize It

Mnemonic

Think of a 'Row' (ろう) of 'Cars' (か) that are all getting old and rusty. They are undergoing 'rōka.'

Visual Association

Imagine a green leaf slowly turning brown and curling up. This visual of biological change is 'rōka.'

Word Web

Cells Wrinkles Gray Hair Memory Biology Time Medicine Society

Challenge

Try to use '老化' in a sentence describing a health habit you have, like 'I sleep 8 hours to prevent aging.'

Word Origin

Composed of two Sino-Japanese characters (Kanji). '老' (rō) means old or aged, and '化' (ka) means change or transformation. Together, they describe the transformation into an old state.

Original meaning: The process of physical and biological decline as one grows older.

Sino-Japanese (Kango).

Cultural Context

Avoid using '老化' to describe a person's appearance directly to them; it is too blunt and can be offensive.

English speakers often use 'aging' for wine, cheese, and buildings, which is a mistake in Japanese.

Japan's 'Super-Aging Society' (超高齢社会) news reports. SK-II and other luxury skincare commercials focusing on 'rōka' prevention. The legend of Urashima Taro, who experienced sudden aging.

Practice in Real Life

Real-World Contexts

Skincare

肌の老化を防ぐ
老化のサインに効く
アンチエイジングケア
紫外線の影響

Health/Exercise

脳の老化を防ぐ
体力の老化
老化防止の運動
健康寿命を延ばす

Sociology/News

超高齢社会
社会の老化
老化に伴う医療費
少子高齢化

Medical/Biology

細胞の老化
老化のメカニズム
老化関連疾患
遺伝的な老化

Personal Conversation

老化を感じる
老化には勝てない
老化のせいだ
いつまでも若くいたい

Conversation Starters

"最近、何か老化を感じることはありますか？ (Lately, have you felt any signs of aging?)"

"老化を防ぐために、何か特別なことをしていますか？ (Are you doing anything special to prevent aging?)"

"老化は病気だと思いますか、それとも自然なことだと思いますか？ (Do you think aging is a disease or a natural thing?)"

"老化を遅らせる薬があったら、飲みたいですか？ (If there was a medicine to delay aging, would you want to take it?)"

"あなたの国では、老化についてどのように考えられていますか？ (How is aging perceived in your country?)"

Journal Prompts

「老化」という言葉を聞いて、最初に思い浮かべることは何ですか？その理由も書いてください。 (What is the first thing you think of when you hear the word 'aging'? Please write the reason as well.)

自分が年をとったと感じた瞬間について詳しく書いてください。 (Write in detail about a moment when you felt you had aged.)

将来、どのような「おじいさん」や「おばあさん」になりたいですか？ (What kind of 'old man' or 'old woman' do you want to be in the future?)

老化を防ぐための理想的な生活習慣について考えてみましょう。 (Let's think about the ideal lifestyle habits to prevent aging.)

「不老不死」が実現したら、社会はどう変わると思いますか？ (If 'immortality' became a reality, how do you think society would change?)

Frequently Asked Questions

10 questions

No, for a car or machine, you should use '老朽化' (rōkyūka) or simply say it's getting old '古くなっている' (furuku natte iru).

It's clinical, so it's not 'rude' like a swear word, but it can be blunt. Don't tell someone 'Your aging is showing' (老化が進んでいますね) unless you are their doctor.

'老化' is a noun/scientific verb. '老ける' (fukeru) is a casual verb that means 'to look old' or 'to age in appearance.' You'd say 'He looks old' using 'fukeru'.

You can say '老化防止' (rōka bōshi) or use the katakana 'アンチエイジング' (anchi eijingu). Skincare products often use 'エイジングケア'.

Yes, it can be used in botany to describe the senescence of leaves or the whole plant.

It refers to 'aging phenomena' like gray hair, wrinkles, or slower reflexes. It's a very common phrase.

No. For wine, use '熟成' (jukusei), which means maturation. '老化' would imply the wine has gone bad biologically.

They are homophones. In spoken Japanese, the context (talking about a house vs. talking about health) makes the meaning clear.

Yes, it's a common word in the JLPT N3/N2 levels (equivalent to B1/B2) especially in reading passages about health.

There isn't a single direct opposite, but '若返り' (wakagaeri - rejuvenation) or '成長' (seichō - growth) are often used in contrast.