The problem, according to all three books, is that for today's young adults, those lean early years -- the Top Ramen phase -- may never give way to the stability and prosperity enjoyed by their boomer parents. A number of factors are blamed, chief among them student loans, credit cards, wage stagnation, the rising costs of health care and home ownership, the disappearance of pensions and the likely collapse of Social Security under the weight of all those retiring boomers.