Dring age 21 or 19

i've actually done research and if you go on an american airline and cross the border you are still on U.S. property. The same goes with if you are on a cruise that launches off from america and goes to cuba or mexico or something, your still on american property. THe only way you would be able to drink is if you were in a different country and were coming back to the U.S. at least thats how it is for cruise ships.

I would have to say 19, because you are on the land of Canada. But I am not for sure, seeing that you are on American Property, Or when does th drinking age change, when you cross the boarder? or when you land? THANKS!

To be honest, I do not really know the drinking age in Canada. So, I can't say for sure.