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по возрасту

for one's age

→ по
phrase Rare #45,269
for one's age Often used with negation: не по возрасту = not appropriate for one's age, or too old/young for one's age.
RU: Он выглядит не по возрасту серьёзным.
EN: He looks serious for his age.

Он был одет не по возрасту.

He was dressed inappropriately for his age.

По возрасту мне уже пора на волю.

Due to my age, it's time for me to be released.

— Карандиру (2003)

Чувствую себя не по возрасту старой.

I feel old beyond my years.

— Всё о моей матери (1999)