Should a 12-year-old be tried as an adult without the possibility of parole?

<p>I don’t want to create this whole argument but what should be the basis of one being tried as an adult vs a child.</p>

<p>Who determines when someone is actually mature and knows the difference between right and wrong? </p>

<p>Why is 18 the legal age for most things in the U.S and not 34?</p>