I’m still in my 20s, but as of a few years ago I started forgetting what’s my exact age. I always have to stop and recalculate it each time someone asks me. I get asked fairly infrequently, but when I do it’s a bit weird/embarrassing that I have to say “wait, let me calculate”. (I know when I was born, of course.)
It seems as if there’s no good reason I’d remember it, since it changes all the time and it is rarely mentioned in practice. But others, including people much older than myself, know their own age immediately.
I’m also terrible at remembering people’s names, I don’t know if that could be related?
As someone with adhd it’s completely normal for me. When you’re a kid you have good reason to keep track of your age because at that time of your life you change dramatically between ages as you develop as a person, plus it’s important when asserting your identity to other as that too develops. When we’re older it’s just a number that only comes up once a year and is not that much different from the previous number, and so it’s easier to lose track of especially for people who have an affected working memory and time blindness like me. Idk if you have adhd or how often people without adhd experience this sort of thing but I can speak for my own experience. I forget how old I am, and other people’s names, all the damn time lol.
I have ADHD too. Most of the time I recalculate my age based on my BF’s that I usually have an easier time remembering.