Interesting chart. Ironically, the pre-teen brain doesn't really look that much less mature than the 20yr old brain. The chart makes it seem like a teen brain is about 70-80% as mature as a 20yr old brain. Also, the justice system throws teenagers with "immature brains" in jail all the time. This would seem to indicate that immaturity is not always going to be a good enough excuse to absolve teenagers of being held accountable for their actions.