Anybody over 18 has no business being with anybody under 16. I mean, really...if you have to say to your friends, "Sorry guys, I gotta go pick my girl up from school", don't you think there's something very wrong with that?
I speak as an Englishman in England, by the way. School ends at 16. I can understand the younger girls having an attraction to older guys - well, that car, that freedom, it's an attractive package. However, at what stage does it become socially acceptable for a 21-year old to be dating a 15 year old? In the real-life example I know, he's 23. She's 15. What the hell?
I also had a similar feeling of shame and 'what the fuck' when a colleague introduced me to his friends....he's 33. They were high-school emo kids. I felt very awkward being introduced by a guy fourteen years older than me to kids four years younger than me. AND being told about their drinking habits all the way down.