The maturity levels don't really differ much either, by then. I certainly know many people younger than 18 that are more mature than most adults. And yet the government gets to decide this. Okay, fine. In most cases, I could understand this. But this is the very same government that does not give those minors the full "freedoms" an adult has(or as much "freedom" as we currently have here, what with censorship running rampant). You do not have full freedom of speech. You can't vote on your country's leader(and yet they can coerce you into fighting, and dying, for that same country). You can't vote for any leader, really. You cannot legally marry. You cannot get medical treatment without parent consent(except in extreme circumstances). You must attend public school(and your parents are forced to pay for this, too). That's quite a bit of human right that you do not have. These are all things that I can't agree with. At least not until you hit close to that age.
So why does the government get to decide what you can do with your body, the one "property" they cannot take away from you(I'm starting to wonder if I should add "yet" to this. I get the feeling if left alone, they'll find a way...)?
A man is known by the company he organizes. -- Ambrose Bierce