One thing I've observed in the SCA (not having kids, but watching a bunch from birth through college) is that the best way to get a kid to grow up to be a responsible adult is to give them appropriate responsibility early.

Agreed. But what constitutes appropriate responsibility in this case? There are duties to being a voting member of our society that I am not willing to require of youngsters - paying taxes is a major one.

I think that changing the voting age would also adjust the age for juvenile crime, another knotty issue.

Here is another question for you... what rights should legal minors have and what should be reserved for legal adults?