Last Updated：2025/12/07

(idiomatic, usually imperative) Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).

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act one's age, not one's shoe size

Source Word

act one's age, not one's shoe size

Verb

idiomatic imperative not one's shoe size usually

(idiomatic, usually imperative) Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).

Japanese Meaning

年齢に応じた、成熟した振る舞いをする。 / 子供っぽい行動を避け、大人として相応しい行動を取る。

In the office manual, the guideline was simple: act one's age, not one's shoe size when interacting with clients.

社内マニュアルには簡潔にこう書かれていた：クライアントと接する際は年相応に振る舞い、子供っぽいことはしないこと。

Sense（1）

(idiomatic, usually imperative) Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).

You should act your age, not your shoe size!

act one's age

（ canonical ）

acts one's age

（ present singular third-person ）

acting one's age

（ participle present ）

acted one's age

（ participle past ）

acted one's age

（ past ）