Have you read that new Atlantic article "Have Smartphones Destroyed a Generation?" I can't remember if it was posted on this forum, or I'm thinking of a different forum, but it's an interesting article. Its main conclusion is that post-millennials are being socialized in a completely different way- their youth do the following things about half as often as earlier generations: date, drive (or get their license), or even just get out of the house and hang out with friends. Most youth literally just sit in their house on the phone all day. Snapchatting has essentially replaced going to the mall with friends.
Maybe statutory rape laws, GDL laws, and parents' fears of their offsprings' friends offering cigarettes, beer, and weed are part of why.