Carnival has a bit more leniency, but even that has changed since Club O2 has switched hands. The structure of the youth programs used to be that Camp Carnival (children's program) was in charge of all agre groups 2 years to 14 years and then Club O2 was kinda it's own separate entity and it was managed under the entertainment branch, making the entertainment director for the ship, the Club O2 director's boss. Unfortunately some Club O2 directors were taking advantage of the extra freedom they had and it ended up causing the 15-17 club being intergrated under the direction of Camp Carnival, loosing a lot of freedom. This is the way that Adventure Ocean on Royal Caribbean works. All ages 18 months to 17 years are part of the youth program and their guidelines are set strict. It's different when a 14 year old want's to bump up to the 15-17 group than when an 18 year old wants to bump down.