A third of Florida's nearly 3 million retirees, 65 and older, now rely entirely on Social Security, according to an analysis by AARP. "Folks have spent down their assets," said Jeff Johnson, AARP interim director in Florida. More Floridians are likely to end up only on Social Security than retirees in the rest of the country: A quarter of U.S. retirees, 65 and older, have only their monthly checks as income, Johnson said. Many of the most strapped are Florida's oldest, he added. Florida seniors, 80 and older, are about three times as likely to depend