Really an amazing insight perhaps not considered enough. But this: "moving from a less structured environment like college into a more constraining one like ni

Really an amazing insight perhaps not considered enough. But this: "moving from a less structured environment like college into a more constraining one like nine-to-five employment, " is telling. I knew people in SF who just 'moved away' and the change in setting, the lack of immediate access to 'the party lifestyle' and all it entails, means they just 'shifted gears' and cleaned up immediately. So I'm not sure if the 'aging out' due to brain developments is entirely the story here, rather than perhaps time allows for people to find other patterns of lifestyle. Though I do think the point about '18 years old' is quite powerful - keeping teens away from bad stuff might seem to be quite a good idea. ... that said, there could be other factors at play: kids from 'good, conscientious families' simply may not be quite as likely to need to try alt things, and less likely to get caught up later in life anyhow. There'd seem to be all sorts of other correlating factors there, however valid the point may be unto it's own.