I know in mexico, its 16+ and in some European countries, there isn't an age limit. But they don't have the alcohol problems that we have. I think we have the alcohol problems because of the age limit. They are desensitized to alcohol at a young age and taught how to drink properly the constant use of it. In the US, by the time we are 21, most are in college or have moved out on their own so they don't really learn proper ways to drink.