Raise the legal drinking age to 21?

So the other night I was watching Q&A on the ABC where they had the PM Kevin Rudd being asked questions by a bunch of 16-25 year olds (I think that was the age group), and one of the questions was "should the legal drinking age be raised to 21" now he waffled a bit, saying there needed to be studies to see if it would have an impact on the road toll, good answer, but when asked his personal opinion if he wants it, he said "of course".

Now this yeah I'll be 30, so it has no impact on me, I don't have kids, don't plan on having kids, so again no impact on me, but one thing I would like to point out, is the double standard.

In Australia 18 is the age when you are considered an adult in all things, you can drink, you can drive (not at the same time you morons), you can enlist, or join the police forces, etc, etc. My issue with the idea of raising the drinking age, which for all I know might actually make an impact, is that it splits that, either you're an adult with all the rights and responsibilities that come with it at 18, or your not.

If you're not careful you'll end up with situations like they have in America where kids are fighting wars before their legally allowed to buy a beer, and frankly, that disgusts me.