Definition of act (or be) one's age in US English:

act (or be) one's age

phrase

  • usually in imperative Behave in a manner appropriate to someone of one's age and not to someone much younger.

    ‘“Act your age” is not advice to behave like an adolescent’
    • ‘What makes the whole thing work on a deeper level is that Curtis not only acts her age but shows it.’
    • ‘It's become apparent in recent years that 40 is the new 30, that 50 is the new 40, that no one wants to act their age.’
    • ‘Since the theme of the week is apparently not knowing how to act one's age…’
    • ‘I can now rely on a regular commentary on their allowance, my manipulation of their weekend schedules to give me time to put my feet up and my failure to act my age when talking to their friends.’
    • ‘What happens when the football stops, when those 35-year-old legs give up the pretence and start acting their age?’
    • ‘So he stands supreme in terms of a sportsman not acting his age.’
    • ‘Just because we can steer the car with our beer bellies these days, it doesn't mean that we have to act our age.’
    • ‘It's here that she realizes that shutting out love won't bring back her mother, and that she really does need to start acting her age.’
    • ‘The rapper is 16 years old and ready to start acting his age.’
    • ‘I won't grow up, I won't slow down, I won't act my age.’
    • ‘People say act your age, but what is that supposed to mean?’
    • ‘They actually acted their age… Most of the time, when we're out for dinner, they tend to poke and prod at each other, clown around etc, I'm sure they do it to wind me up.’
    • ‘‘But I have never felt or acted my age, and I didn't want to start now,’ Heather says.’
    • ‘This year something remarkable has happened in Hollywood: women are everywhere, playing the best parts, even acting their age.’
    • ‘Just for You is more sedate in tone, and both stars are playing more mature characters - indeed, since Bing has a teenaged son in this movie, it's appropriate for him to act his age a little more.’
    • ‘And no, this is one actress who doesn't change the subject when you ask her age and, yes, she's comfortable with ‘acting her age’, never mind that she had been a heart-throb when she left the industry.’
    • ‘You know what happens when you don't let kids loose, when you take away their right to act their age or be better than someone else at something or be able to win, place or show?’
    • ‘I would have to change my ways completely, I'd have to grow up, act my age, be responsible and actually have a go at making a relationship work.’
    • ‘Ah, with that cute smile one can only hope that she grows up to be a good person, still acts her age and does not become the typical self-conscious Indonesian celebrity.’
    • ‘They no longer feel that they have to act their age, but have released themselves to no longer worry ‘What will people think?’’
    • ‘Yes - this winter showed me that I'm not a youngster any more - even if I still don't act my age!’