Age restrictions and information on booking a holiday? PLEASE HELP very important?

Since you put this question under cruise travel, I have to assume your talking about a cruise. If so, the minimum age for someone to go on a cruise without an adult is 18 and that is only with a couple of cruise companies. Now if your talking about a resort and not a cruise, for the most part they also do not consider you an adult until your at least 18 if not older.