Sure, but I don't think the 18-year olds in the UK don't start drinking before, either. I think whenever it's actually legal, you abuse your right to drink by doing so excessively. I might be wrong, though.
More recently, they've started to crack down on underage drinking, and now the police blotter fills a column in the campus newspaper with a series of "Driver arrested on suspicion of DWI." Hopefully this is a result of them cracking down on drinking and driving too, but I fear that to some extent it's because they are forcing the parties off campus.