guys on this forum complain way too much about girls.
I agree with those who say girl mature faster, etc. but it can also be about peer pressure and status. there's less pressure dating someone not in the immediate social circle, than dating someone everyone else knows, blah blah blah. hence, why high school girls date college boys because they actually made it to college and there's a status thing going on there, blah blah blah.
by the way, they don't always go out with older guys. girls mostly just go out with guys you don't like.