act one's age

idiom

Definition of act one's age

: to act in a way that is appropriate for a person of one's age You should learn to act your age.

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“Act one's age.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/act%20one%27s%20age. Accessed 20 Jan. 2021.

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