Well, there are those of us that would raise the age of majority back to 21 years old for "virtually everything."
There's plenty of research that indicates that those under 20 (and, in fact, up through somewhere near to 25, but to a lesser extent as age progresses) have not yet reached mature brain development and myelinization.
Yet, oddly enough, with the above being said I think the idea of a drinking age is stupid, and the anecdotes offered above show why. You don't learn to drink responsibly by alcoholic beverages being "forbidden fruit" until some arbitrary age, but by being exposed to them, by responsible adults, like you are to most other things as you make your trip from child to adult. I'm of the opinion that a huge part of our binge drinking culture among the college-aged would disappear were the stupid "forbidden fruit" aspect of how the United States treats drinking were to be removed. You just don't hear about this kind of behavior on the scale we see it here in countries where there is no legal drinking age.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story