Some of the sociologists, psychologists and demographers who study this new life stage see it as a good thing. The twixters aren't lazy, the argument goes, they're reaping the fruit of decades of American affluence and social liberation. This new period is a chance for young people to savor the pleasures of irresponsibility, search their souls and choose their life paths. But more historically and economically minded scholars see it differently. They are worried that twixters aren't growing up because they can't. Those researchers fear that whatever cultural machinery used to turn kids into grownups has broken down, that society no longer provides young people with the moral backbone and the financial wherewithal to take their rightful places in the adult world. Could growing up be harder than it used to be?