I'm 18, will be 19 before I go on my cruise. Can someone please tell me what the age restriction is? And, how much are drinks?

carnival says 21 

21.  Carnival doesn't want the liability and responsibility of harboring an under-aged drinker, so if you are a "sneaker"  you'd better play it cool and act older than your age!  Many adults complain about young adults getting out of control and ruining the cruise for the rest of the passengers, so remember, if you get loud, you'll get in big trouble.  The only persons I've seen puke in the elevators are the sneakers under 21.  Have fun!  

Goto Mexico. There is no drinking age there. My brotherinlaw 17 got wasted and it was the best thing i have seen there. So make sure you goto Carlos and Charlies