There is no drinking age law in international waters. Most ships set the drinking age to whatever it is in the ship's country of registration. For US, it is 18 because federal drinking age is, surprisingly, 18. All “21” drinking age laws are state laws.
Passengers under 21 years of age must be accompanied by a parent, guardian or chaperone who is at least 25 years old; one adult chaperone is required for every five people under 21.
ALCOHOL POLICYThe minimum age to consume alcohol on Royal Caribbean ships on sailings originating in North America or the Caribbean is twenty-one (21). The minimum age to consume alcohol on Royal Caribbean ships on sailings originating in South America, Europe, Asia, Australia and New Zealand is eighteen (18).
?? Can You Drink in Aruba at 16? As we mentioned above, the legal drinking age in Aruba is 18 years old. Unlike in Germany, it means that if you are 16, you won't be able to legally purchase or consume any type of alcohol while on the island.