look your age
look (one's) age
To have an appearance (especially one's face) that is consistent with what people expect someone to look like at that age. I don't look my age now that I have this beard, so I never have trouble getting into bars. With all these gray hairs, I'm really starting to look my age.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
ˌlook your ˈageseem as old as you really are and not younger or older: I was surprised when I last saw her — she’s really starting to look her age now.
Farlex Partner Idioms Dictionary © Farlex 2017