I'm 72.
I think a person's 50's & early 60's are awkward. You're still too young to think of yourself as old. But you're also not really young anymore. I gave up having anything to do with my birthday many years ago. For a long time, up until quite recently in fact, I had to keep reminding myself I was / am as old as I am. But lately I've begun to feel my age. And that's not necessarily a bad thing. It creates some congruency between how old I really am in years and how I perceive myself. There's something to be said for that...