Exactly. Will there be abuses at first? Sure. Everytime they
   lower the drinking age, there's problems at _first_. But give it
   enough time, and the excitement will settle down. They usually
   bring it right back up again whenever they've tried it in the
   past. Plus, I thought of this too: It's often hard to tell the
   difference between 18 and 21 yr olds at a glance.. But, it's
   usually easier to tell the difference between 16+18 yrs old. [I
   think, anyway and of course this is a huge generalization]
   Thinking as if I was a person whose job it was to serve alcohol
   (liquor store, bar, etc), it would be a lot easier to proof on
   sight. The reason I'm thinking this is: I think ppl do most of
   their drinking before it's legal, often because it's not legal
   yet and once it's legal it's like, "meh, whatever". But if it's
   legal (and once it stops being novel) at 18+, the "ooh, it's
   illegal factor" will drop in age and anybody whose job it is to
   play "age spotting" to keep ppl from breaking laws would likely
   have a much easier time of it. I know it's superficial - likely
   ridiculous. But I'm trying to think of it from a systems point
   of view: how it would affect day-to-day activities in a town or
   city and all of the people that are involved in the process of
   liquor usage and regulation. But ultimately, I agree. You're 18.
   You're supposed to be an adult and yet you're not yet. This
   extends to other things as well, such as minimum age to be
   President of the USA and such, but I guess changes have to start
   in different places for different reasons.