If he was asking to see a 13-year-old's t1ts when he was 17 he doesn't sound hugely mature. He probably couldn't GET a girlfriend more his own age as your DD is all star-struck by this big mature older guy and he ain't gonna get that with 18-19year old girls.

He MIGHT have been asking if her parents like him because he's concerned about asking her out and upsetting you guys, but equally he might just be scared he'll get chased off if he goes anywhere near her.

I went out with a 20 year old when i was 14. My parents were being "softly softly" about it. I think if they'd forbidden it and told me they valued me too highly to let me go out with some loser who has to date people 6 years younger than them i might have valued myself a bit more too. Still, we live and learn.

You could try suggesting to her that she suggests to him they hang out at YOUR place - that'll put him off if his intentions are anything but honourable.

Bx