The argument of what age drinking should be legal is interesting. First, alcohol related deaths/accidents occur everyday with intoxicated drivers including those under 21 but also those way above that. The no age is right but at a certain age the brain is fully devolved so after that point they can't damage development and will learn from mistakes or be selected natural. Older don't get hurt as much because they almost get hurt young. "live and Learn".
Side note the US has the age of 21 but of places have different ages for drinking so if you don't like the drinking age go some where that alcohol is banned (or frowned on) like Utah