act/be your age

act your age

If you tell someone to act their age, you are telling them to behave in a way that is suitable for their age, because they are behaving in a childish way. One patient complained that the nurse had told her: `Act your age and pull yourself together.' Note: This expression is used to express disapproval of someone's behaviour.
See also: act, age

act your age

behave in a manner appropriate to your age and not to someone much younger.
See also: act, age

ˌact/ˌbe your ˈage

(informal) (often used as a command) stop behaving like a child: You’re behaving like a couple of kids. Act your age!
See also: act, age