For the US (since the 21 drinking age is here) I agree that 19 is an appropriate age. I started drinking at 16 and experimented over the years and now I know how I get when I've had too much. Armed with that knowledge I can safely buy the correct amount of alcohol that I want to drink or maybe bring to a party. I cant speak for everyone of course but if it is introduced and we are allowed to buy it at 19, then i feel in the long run it wont be as much of an issue. A lot of teens now seem to get burnt out by the time they turn 21 from binge drinking that its like why bother.