Considering things on an individual basis is all fine and good in theory but it doesn't really work in practice sometimes. I mean, my son is smart, respectful and very mature for his age. There are some 18+ activities on the ship he would love to take part in and I'm certain that if it could be arranged he would behave perfectly. So then what? They let him in AND all the other kids who's parents think they are smart and mature AND all the kids who aren't all that mature but who really, really want to go? What's the point of age limits at all if everyone is a special case?