The Edge is a lot like middle school. Each cruise is different obviously, but from my DD's experience, it is pretty much like the social dynamic at Middle School - the younger kids may want to fit in, but some are not as socially (or physically) mature as the older kids, and may not get into the little groups that form on the first night. Granted if it a full ship during high season, there are a bunch of kids spanning the ages, but just like all of those "mature" 4th and 5th graders at the Elementary School, many are not ready for the social change that comes with middle school. If your kids are not exposed to the PG 13 content at home, then they may not be ready for the conversations that may arise in the Edge. Similar to those 13-14 year olds who are dealing with getting through 8th grade may not prepare them for the things that the 16 and 17 year olds in the Vibe have going on in their lives. That being said, there are still a lot of structured activities that go on which involve all ages, but remember, Edge is not a check-in facility - they will be able to come and go as they please and some activities take them all over the ship unsupervised.