act one's ageRate this phrase:(0.00 / 0 votes)Say it
To be mature and not childish.

Act your age and stop fiddling with that pen - you're showing us up.

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"act one's age." Phrases.net. STANDS4 LLC, 2017. Web. 22 Nov. 2017. <http://www.phrases.net/phrase/act-one%27s-age_1890>.

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