Yeaaaaah. See. Questions of ageism aside, there are different stages of life. She has yet to go through most of them. She can't even join ya'll in a bar if that's something you do. There's an inherent power imbalance there, and one that can't really be fixed until she's at least past the age of 21.

Creepy factor is half your age plus seven. So, for him, 24.

He's too old for her, and this is creepy.