The minimum drinking age onboard is 21 years old for cruises departing from U.S. ports and 18 years old for cruises departing from non-U.S. ports. Passengers . Learn more about the legal drinking age policy onboard a Royal Caribbean cruise. Aug 5, The legal drinking age in the United States is 21 years old. There's no getting around it. If you want to buy booze, you have to be of legal age or. What Is The Drinking Age On Royal Caribbean Cruise Ships Sep 5, How old do you need to be to drink alcohol on a cruise ship? a important question asked by parents and teens alike. Get answers to your party. Learn more about the legal drinking age policy onboard a Royal Caribbean cruise. This policy pertains to all cruise durations. Drinking Alcohol On Board The minimum age for the purchase and/or consumption of alcoholic beverages in the bars.