There are a lot of ways we can define adolescence, but I think most people would agree that it is a stage that precedes full maturity. Likewise, there are lots

There are a lot of ways we can define adolescence, but I think most people would agree that it is a stage that precedes full maturity. Likewise, there are lots of ways we can describe maturity -- physical, cognitive, emotional, behavioral -- but I think a hallmark of adolescence is that decision-making is (generally, at least) more impulsive, more hedonistic, and more selfish. And that, at least, is what I have seen among friends and acquaintances who have taken a long time to leave their adolescence behind them. It's not just their living situation or their financial situation that can be called adolescent -- it's their general maturity and decision-making. Perhaps, as Prof. Steinberg argues, the negative of immaturity is balanced out by the positive of brain plasticity ... but I wouldn't be surprised if immaturity + plasticity could be even more problematic than immaturity alone.