How to say "ages" in Japanese

• 幾世いくよ
  nounCovers 'ages' as a long stretch of years, with a nuance of generation following generation. It is less common, so it is seldom the word learners need for ordinary talk about long periods.
  この儀式ぎしきは幾いく世代せだいにもわたって伝つたわってきた。↗

  This ceremony has been handed down from generation to generation.
• 百世ひゃくせい
  nounCovers 'ages' as a long era, with a nuance that extends to eternity. It is also less common, so it is rarely the right choice for everyday speech.

Both are less common, so neither is an everyday word: 幾世 frames 'ages' as generations and years passing, while 百世 frames it as a long era with overtones of eternity.

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

• 幾世いくよgenerations
• 百世ひゃくせいlong era