In Australia, 18 is the legal age for everything, except sex, which is 16, and we're allowed learner permits at 16, but have to have a licensed driver with us. We get our P plates at 18 and a full license at 21.
I have to admit that I personally think the legal drinking age should be raised to 21. Research shows that drinking, especially binge drinking, while the brain is still developing (it stops around the age of 24) can do permanent damage to short and long term memory. Also, a lot of fatal car accidents seem to involve P platers. Taking alcohol out of the equation might save some lives.