I say for sure go Carnival!!! Me and my friends and family have been on a few and the age group varies... Were going on the Conquest for June 2004 and I have always been told that they have the best age group?? I am 28 yrs old and there are always alot my age and some younger some older... ALWAYS A TON OF FUN!!! I think the Royal Car. has alot of older folks on their ship but I have never been on one so cant say for sure??