[glenra]

By that logic, we shouldn't hold 24-year-olds responsible for their actions either, right?

Anyway, what makes you think having a "fully developed" prefrontal cortex means one DOES "know the full extent" of one's actions? And what makes you think full development means one knows this better than 50% or 75% development? Heck, for all we know, moral responsibility might even peak at 15 and decline from there with further development!

Is there some sort of test that shows how much people have, as you claim, "a distorted view of reality" as they age?