Cruise ships are usually registered in other countries and their ideas of who is an "adult" are different than the US. Cruise Lines also possess a minimum age policy. In most cases this is 21 years of age and means that anyone below this age will be unable to travel without adult supervision.If you DO find a cruise line that will take you, remember that tipping is very important. It is expected on a cruise ship. Budget for it.
www.cruisespirit.com.au