Raise drinking/driving age to 21?

[Franco Cozzo]

I noticed in another thread some people mentioned raising the drinking/driving age to 21.

About the drinking age, theres kids at the highschool I used to go to who start drinking as early as year 9, 14/15 year olds, what would raising the drinking age do, really? It might keep it out of the honest 18 year old but everyone else will just get their older friend/brother/sister to buy it for them?

Discuss.