Originally Posted by
flyerwife
I use
www.vacationstogo.com as a great starting point.
You should definitely check with whichever cruise lines you are interested in as many have age restrictions per cabin which might impact your group.
As long as you are all over 21, you should be fine. When making a booking, they'll take all of your age details anyway, so no surprises for them when you board.
If you are looking for livlier cruises, Carnival is probably your starting point. Consider NCL too as they have "Freestyle" - no set dining time, dress code etc and over spring break attract a young crowd. Royal Caribbean could be a good option for you too, as could Princess - all resort-style mega ships with plenty of choice of restaurants (more so Princess) and loads of bars and good nightlife.
Good luck.
Mark