I can't believe you all think it should be lowered. When you are assigned to respond to a drink driving accident when a drunk 17 year old killed himself and 4 other people, and you have to notify the parents I think you'll change your mind.
Case and point. 18 year olds are NOT mature enough for alcohol.
I have never driven any night after I have been drinking, and that includes when I was 18. So what did I do wrong?
Usually when I go to parties I'll walk to the party, and call a taxi or get a ride from someone else if I can't walk back. I'll probably still do that in 4 months when I'm 21.