Yahoo! Finance:  Deferring retirement, even for several years, won’t guarantee even a bare-bones retirement for millions of older Americans, according to a detailed study by the Employee Benefit and Research Institute (EBRI).  In fact, the lowest-earning 25 percent of Americans would have to work until age 84 so that 90 percent of them would have even a 50-50 chance of having enough money to afford basic living expenses and out-of-pocket medical care.