My biggest problem with this is that only 6 countries have the legal age to be 21. Let's put that into perspective, 27 countries don't even have a legal drinking age so why should we? 60% of countries have the legal drinking age of 18 or 19, I vote that the u.s. should be one of them.
At 18 years old individuals are considered adults. It only makes sense to be able to do anything any other adult can do, legally. Most people that are 18 are drinking anyway. They might not be going to the bar but someone is buying them alcohol and it is almost impossible to enforce the 21 and over drinking age, if they are drinking anyway.
If the age was lowered to 18, then people would drink at 16. If it was lowered to 16, then people would drink at 14.
The age of 21 is recognized as a valuable gradient of enforceability that has nothing to do with actual enforceability. Yes, it is actually enforced at times, but not always.
No, the US drinking age should not be lowered from 21 to 18 as a drinking age of 21 is enforceable. This is proven by the number of persons under the age of 18 that are turned away from many bars, and the number that are caught driving drunk otherwise.