It's no secret that falling behind on student loan payments can squash a borrower's hopes of building savings, buying a home or even finding work. Now, thousands of retirees are learning that defaulting on student-debt can threaten something that used to be untouchable: their Social Security benefits.

http://www.smartmoney.com/borrow/student-loans/grandmas-new-financial-problem-college-debt-1344292084111/