verb
to behave in a manner that is appropriate for one's age
adjective
describes the age appropriate behavior being exhibited
pronoun
refers to the person whose age is being referenced
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It is important to act one's age in professional settings to maintain professionalism.
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Come on, stop being so immature and just act your age.
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Dude, quit acting like a kid and start acting your age.
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She needs to learn to act her age and stop trying to act like she's still in high school.