> I will be pretty far past the cutoff point for fixing my social life and still managing to be relatively "normal"
There's no cutoff for this, and don't let anyone else decide what's "normal" for you. Or barring that, don't let other people's perceptions of normal prevent you from doing what you need to in order to be happy.
People you want to form relationships with are going to have expectations of your experience, skill, and maturity levels that increase with age. You’re going to find fewer people willing to tolerate your adolescence at 45 than you will at 25. Beating yourself up over “normal” isn’t helpful, but this is a real problem.
I'm not discounting the challenges, just the idea of some arbitrary "cutoff" where relationships (romantic or otherwise) are no longer possible. Certain things might become harder as you get older, but there's never a cutoff (and some things might actually become easier).
(I originally responded with a different message that I deleted, since it looks like you edited your message in such a way that my original reply wasn't super applicable anymore.)
There's no cutoff for this, and don't let anyone else decide what's "normal" for you. Or barring that, don't let other people's perceptions of normal prevent you from doing what you need to in order to be happy.