Carnival Cruise line seems to be geared more to the younger crowd. Myself (21) and some friends 21-24 are all going on a Carnival cruise to the western carribbean in January. We booked early so it was only about $389 per person. Definitely look into Carnival. Princess and Royal Carribbean tend to have more of the older age range on there. Especially princess. I went on a Princess cruise and everyone was 40 and older just about. They had the game bridge as a daily activity. Not my type of fun.