It is always risky to generalize but... after a career in industry, I teach engineering at a university and I've found that many teens and 20-somethings simply do not have any experience with tools or machinery (the proverbial farmers kids). These young folks are really bright and have they remarkable IT skills - but ask them to torque a bolt, adjust an idle mixture screw or even read an electrical schematic - and they're helpless. As Gary says above, they have to come to us - and they seem to be reluctant to even try to learn sometimes.
I blame the fact that most school systems have eliminated technical shop classes due to the cost and liability issues - but as a consequence, we are raising an entire generation of kids who can "think" - but often cannot "do". Who will be the carpenters, plumber and mechanics of tomorrow...? The young kids who do take up those trade will do verrry well in my view.
Pete