歳さいの割わりに

suffix

for one's age; considering one's age

Attaches to a number + 歳 (or 才) to express that something is unexpected or noteworthy given the person's age. Often used when someone seems older or younger than their years, or when an ability or trait is surprising for that age.

• 彼かれは10歳さいの割わりに背せが高たかい。

  He is tall for a 10-year-old.

• 祖そ母ぼは80歳さいの割わりに元げん気きだ。

  My grandmother is energetic for an 80-year-old.