I have a college sophomore. He was at the finish line party with a friend and had a blast. I would not have wanted him there at that age. It was crowded the lines were really long. And I think he would have been bored at that age. There was just not much to do except eat, drink and listen to music.
Having said that, there are plans to change things for this year. So you might want to wait and see what's going to be open. It will make for a REALLY long day for them. Do they get cranky when they are tired?