I agree on lowering the drinking age. I'd take it all the way down to 16 or 17 to get kids some exposure to legal drinking prior to heading off to college. It seems to work most everywhere else in the world. But, I'd also raise the driving age to 20 (farm kids could still drive combines at 14 bc that's awesome). I would also raise the voting age to 30 unless you either (a) enlist in the military, or (b) own real property. I would also re-ban pot because, while there's always an exception that proves the rule, I've never met a frequent pot smoker who wasn't a lazy slob. I knew some pretty smart kids in high school that got heavy into weed. Things did not go so well after high school for them.
All of these changes would significantly improve our society and government.