My S recently went through a breakup and is dating someone new regularly now. He’s 6’3" though, maybe it’s that extra height? 
FWIW both women he met IRL, through mutual friends. D did meet her current BF via an app.
I’ll buy the “kids are waiting until later” thing though - neither one of mine really had HS relationships, both were what I’d call late bloomers, at least compared to me and my cohort who were mostly very active in the 80s, in HS.