I love the nature versus nature debate. Personally I'm in the both camp, however, I don't believe experience is everything, because a five year old is as much a person as a sixty year old with more experience.
I happen to fall into the both category, mostly because of the twin studies I've read. Though, admittedly those were rare and selective and could have been chosen to prove the point as opposed to disproving it.
where do you draw the line when it comes to allowing the government to rule over ones own body?
That's a tough question. The way I view that is somewhat cynical, because what I would want, even with voting, things may not go the way I want. However, the way I see it is that most things are cyclical and while I may disagree with how things go at one point in time, we have a wonderful governmental design allowing things the opportunity to change at a later date.