I've been saying this for many years... the age should be lower. You can search my old posts and find other instances of me pointing it out here. MADD uses faulty reasoning and analysis of statistics in its claims that raising the drinking age reduced DWI deaths. Did the rate of deaths in DWI accidents go down after the age went from 18 to 21? Certainly - but MADD attributes that to causation, not correlation. Around the same time (at least in NY), mandatory seat belt laws came into effect. Airbags were just starting to become more common. It's like draining a bathtub, and after the water has already been going down for a minute or two, tossing in a rubber ducky & claiming that the water is continuing to go down because of the presence of the duck.
If we wait til "children" are 21 years of age before they're allowed to have alcohol, then who is going to be present to help them learn to drink in moderation and respect alcohol? At my son's graduation party, my wife and I would have each risked our professional licenses if we provided even a drop of alcohol to anyone underage at the party. Plus, we (and every other parent of a graduating student) were given a notice (sponsored in part by MADD) that said they were going to be out looking for that this year & wouldn't be stopping at a level of warning. Quite frankly, that still leaves me a bit pissed to think that not only wasn't I allowed to use my best judgement, but that they were going to be aggressively targeting parents who provided even a single drink to their graduating child.