act (one's) age

act (one's) age

To behave in accordance with one's expected level of maturity. Really, John, act your age a little. You're like a child sometimes! I'm glad that Sarah is so committed to her studies, but sometimes I wish she would act her age and go out with her friends a bit.
See also: act, age
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

Act your age!

Behave more maturely! (A rebuke for someone who is acting childish. Often said to a child who is acting like an even younger child.) Child: Aw, come on! Let me see your book! Mary: Be quiet and act your age. Don't be such a baby!
See also: act
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

act one's age

Behave more maturely. Although the phrase often is used in asking children to act in a more grown-up fashion ( Only babies suck their thumbs; act your age), it also may refer to an adult who is, sometimes deliberately, acting much younger than might be considered appropriate ( Grandpa, it's time you stopped climbing ladders and acted your age).
See also: act, age
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

act your age

behave in a manner appropriate to your age and not to someone much younger.
See also: act, age
Farlex Partner Idioms Dictionary © Farlex 2017

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
Farlex Partner Idioms Dictionary © Farlex 2017

act your age

Don’t be childish or act foolish. This admonition appears to date from the 1920s. “Be your age” is the caption of a 1925 New Yorker cartoon; “act your age” appears in a 1932 issue of American Speech, a journal that chronicles current usage.
See also: act, age
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
See also: