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?
Not unusual at all. Everyone I know does this. Nothing wrong with you it’s just that age (and birthdays) becomes less important. Also once past a certain age you actively want to forget that you’re old, so you need to consciously think about it.
But don’t worry, once you get into your 80s it becomes a badge of honour and the older you get the more you’ll think about it.
Thank you for being so optimistic :)