This is an amusing thread. All these people earnestly arguing to Illbay how the drinking age should be lowered.
You're not going to convince him, though, as he favors total prohibition of alcohol. Go ahead; ask him.
Personally, I favor a more mature approach to alcoholic beverages than we currently use. The current model encourages irresponsibility and binge drinking. This is one of the few areas in which I think the Europeans have a better approach than us.
But if you lower the drinking age, the liberals will try to lower other age limits as well. They will want to lower the smoking age, the age of consent, just about anything.
And it will set a precedent that will have consequences no-one will want to deal with. Or take responsibility for.
That, and the "Legalize poT" crowd will want to be pampered as well.