Hey, I figure this might be somewhat of an obscure ask. But like body language and other topics like it, there might be some physical indicators of age. Now there are the extremes, we can tell the age ranges someone might fall in, but does anyone have any guides/information on this sort of thing?

Example: I saw Halle Berry in a UFC thing recently and she looks the same as she did 10 years ago.
Most of the people I have met recently are quite a bit younger than me ~18-22 and I'm having problems sorting the age (I'd like someone closer to me if possible) Thing is, I have found I'm really bad at estimating age, my ex I guess looked "young" considering I thought these girls looked in her age group (she's 30).

Of course its easy to figure out the age after I talk to them but I find it rather awkward to extricate myself from the situation after I realize they are too young for me. It seems inappropriate to mention the age gap? Or should I just joke about it to let them know I'm too old for them. It definitely does get awkward later because they don't know why I went from warm to cold for seemingly no reason.