The transition to adulthood used to be one of the main goals of the young. Adulthood was seen to be a status worth achieving and was understood to be a set of responsibilities worth fulfilling. At least, that's the way it used to be. Now, an entire generation seems to be finding itself locked in the grip of eternal youth, unwilling or unable to grow up. Concern about this phenomenon has been building for some time. Baby-boomer parents are perplexed when their adult-age children move back home, fail to find a job, and appear to be in no hurry to...