I'm not a pedophile if anyone is wondering.
Given your age in your profile, it would be very difficult to even think of a way a DSM-IV approved diagnosis would even be applied to you :P
I could go on in great detail about the criteria for such things, because there are, as is the nature of this topic, many nuances. But obviously that's off-topic, so I'll save it for elsewhere.
Hm, okay, so let's come back to the original thrust and maybe emphasise something else. Moegreche has pointed out that we need a legal precedent, which serves as justification for the existence of such thing as a legal age based on chronology as opposed to some "standardised maturity assessment".
The question then is: Do you think the current standards are acceptable? What are the criterion that ought to be paid more attention to? For example, I've pointed out the discrepancy between the documented behaviors and the letter of the law when it comes to drinking and sex.
The condition for there to be an argument to change these laws would be to demonstrate that in their operation, they do more harm than good. For example, one could focus on the controversy over whether to try a person "as a child" or "as an adult", as is an increasingly reported trend with regards to violent crime.
