When I was a small child, for a while I was a prodigy at guessing ages. My mother would bring me into a party, or introduce me to guests and tell me to guess their ages. I could see the lines and signs of age. I used to upset some women because my guesses were very good. I thought 50 was very old.
So when I actually hit 50 myself, I could remember my childish reactions to 50 year old faces and shudder.
Sadly, i lost the ability to guess ages accurately by the time I was a teenager and now I can hardly do it at all.