Two more words: Jail Bait!
I can just see if we would have told the 20-21 year old guys walking into our mixers "oh by the way, there is a 15 year old here, so mind your P's & Q's"...they would have freaked!
Most of the early entry college types (I mean 13-14, not 16 or 17) I've heard of have very little interest in partying, it's all about studying. I really question whether these parents are sane or know what they're doing. One more argument against homeschooling, IMO...