act (one's) age

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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
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References in periodicals archive ?
I decided not to act my age. I did not drive myself ahead of life and merely let life take the best of me.
Where Do Broken Hearts Go and Act My Age will partic- particularly get the crowd bouncing when the boys go on the road again next year, while Night Changes and Fool's Gold provide the heartfelt Little Things-esque ballads that will make you fall in love with them a tiny bit more.
I doubt that this will come to pass, although I do like to dance and even forget to act my age on occasions.
Live Blondie Clyde Auditorium, Glasgow 01.07 "I'M trying to act my age! I know I'm far too late, though, but what the ***!" Dressed in a fetching pink minidress, platinum blonde wig and a coat made of dead leaves, Debbie Harry was acting anything but her age and was all the better for it.
So in light of this, I am not going to nurse my bad back, rest my aching bones and act my age.
I'm 58 and everyone says I don't look or act my age but I'm married to a man of 63 who thinks he has one foot in the grave and he's been like this for years.
I might have turned 40,and stared death in the face not so long ago, People tell me to act my age and I'mgoing through a mid-lifecrisis,but naa, I