Not that I agree with it anyways, but unless you can change that it is going to remain 21.
I feel like that's a bit of an oversimplified correlation. There have been a whole lot of pushes against drunk driving besides just changing the drinking age,. It might help, but getting rid of drunk driving is much more of a cultural thing than anything that can rely entirely on trying to keep younger adults away from booze.
Personally, I think the whole absolute prohibition idea is fundamentally flawed. It'd make a whole lot more sense to allow drinking at younger ages (such as 16) with parental supervision (or supervision by a parentally-appointed proxy). Minors are going to drink no matter what the law is, so you might as well get them drinking in a controlled environment rather than having them hide away somewhere with only their peers to guide them. That's a much healthier way to learn about alcohol, even if you keep the current drinking age as the minimum for solo drinking.
Drunk post! ---
(\/)(\/)|-| There are precious few at ease / With moral ambiguities / So we act as though they don't exist.