Hello PG, you wrote something yesterday about grumpy old people and frontal lobes, and Rixter wrote about impulse control. I get to work with several clients every day who have "different" frontal lobes and other neurological stuff happening.
.
A paediatrician told me that when he sees his patients with ADD in their 20s they are completely different people simply because the brain has grown. Having had a teenager with ADD who is now 19, I can attest to that. She now thinks before she does something and is extremely responsible and reliable. Phew.