Does Age Regression Reform Criminals?

I have a book review on rehabilitating criminals in today's New York Post. From the piece:

According to Hubner, the "most crucial parts of the brain develops 95 percent of its capacity in adolescence. It doesn't even begin to develop until you hit 11 or 12 and doesn't finish until you're 19 or 20." But, if that were true, then it would be reasonable to ask if society should even want those under 21 voting if the "most crucial parts" of their brains aren't functioning.