I actually have experienced the same depression and listlessness you described, and I imagine a lot of it could be tied to the constant lack of choice and excessive amount of expectations that our current, mill-like educational system forces students through. I definitely agree with you that our system, one that burns so many kids out about caring about anything, needs an antidote. But, along the lines that you said, I don't think that the antidote is necessarily forcing kids to take on full adult responsibilities at age 15. I guess I can see a real-life-buffered educational system that allows for more responsibility and choices without going so far as asking kids to start working full time and living on their own at age 15.