Infants sailing on a cruise must be at least 6 months old as of the first day of the Royal Caribbean International's age policy for gambling and consumption of. Enjoy Casinos at Sea; Norwegian Cruise Line's selection of games and entertainment for the perfect casino cruise. Must be 18 years of age or older to play. Answer 1 of 3: Are the ages the same on every ship? I understand it to be Drinking-wine or beer at age 18 with parental permission Casino gambling Hard.