Last edited by other; 09-16-09 at 06:30 PM.
Teen drunk driving has declined by around 60 or 70% since the drinking age has been increased to 21 on the federal level. Thats reason enough to have a drinking age of 21.
I'm a strong believer in natural laws, where full self-ownership is something you either have or you don't. Young children, not-yet-emancipated teenagers, prisoners, and the mentally insane need their parents / legal guardians permission to buy anything, including drugs, tobacco, alcohol, sex-related products and services, and so on. Self-owning individuals don't need anyone's permission. That's all there is to it - no arbitrary laws or age limits required.
Furthermore, someone might be under contractual obligations not to drink alcohol under certain conditions, regardless of age. For example, a private defense agency might microchip their employees and get instant wireless data on what's in their blood.