How to say "ageing" in Japanese

• 老化ろうかCommon
  suru verb, intransitive verb, no-adjectiveCovers ageing as deterioration: the body, skin or organs declining with age, and similar wear in things. Choose it when the emphasis is on decline rather than simply getting older.
  老化ろうかを防ふせぐためにもっと体からだを動うごかすべきだ。↗

  You have to get more exercise in order to stave off senility.
• 加齢かれいCommon
  noun, suru verb, intransitive verbDenotes growing older as a neutral accumulation of years, naming the fact of ageing rather than any resulting decline. Typical of medical and scientific writing on age-related change.
• 老いおいJLPT N3approx.Common
  no-adjectiveRefers to old age itself — the state or experience of being old — rather than the biological process. Often carries a personal, reflective tone when speaking of one's own advancing years.
  少年しょうねん老おい易やすく学がく成なり難がたし。↗

  Art is long, time is fleeting.
• 熟成じゅくせいCommon
  noun, suru verb, intransitive verbAgeing only in the sense of maturing or ripening: cheese, wine or meat developing flavor over time, and figuratively a plan or idea reaching maturity. Never the word for people or bodies growing old.
  ワインはたるの中なかに入いれて熟成じゅくせいさせる。↗

  Wine is put in casks to age.

Use 老化 for age-related deterioration, 加齢 for the neutral accumulation of years, 「老い」 for old age as a state or experience, and 熟成 for maturing or ripening, as of food or plans.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 老化ろうかageing
• 加齢かれいaging
• 老いおいold age
• 熟成じゅくせいmaturing
• エージングaging
• 高年齢化こうねんれいかageing (of a population)
• 老けふけaging
• 高齢化こうれいかaging (of a population)
• 経年変化けいねんへんかchange over the years
• 経年けいねんpassing of years
• 時効じこうageing