My wife and I sailed on the summit last march and we are booked on the Summit for the 11 day western caribbean this december. Last year our dinner companions brought along their two teenage daughters. They said there were only 12 other teens on the ship. On cruises that go longer than 7 days the number of kids seems to go down. However the important thing to note is that their kids were having a great time. I remember they had a staff just for kids. Dont sweat things will be fine.