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The phrase "act your age" is correct and usable in written English.
It is typically used to reprimand someone who is behaving immaturely or inappropriately for their age. For example, "John, I expect you to act your age - put away your toys and go do your homework!".
Exact(28)
Don't act your age: act like a manager.
"Oh dear," he sighs sarcastically, "act your age".
The unspoken conclusion to this triptych was "Now act your age, belt up and do as I say".
The ad urged youngsters to "act your age" by renouncing their parents' car insurance and buying their own.
Do you act your age?
4) It's fine to act your age.
Similar(29)
The headline reads: "Acting your age.
There's time until you become a teenager, so act your own age and wear appropriate clothing.
Act your old age.
Act just your age.
The body of science suggests your mind is incredibly susceptible to the environment you put it in, and your body is likely to act the age your mind tells it to.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com