No Statute Of Limitations?

Shouldn't there be a limit on this sort of thing? From KETV in Omaha:

An orphan is being asked to refund money paid to him 30 years ago by the Social Security Administration.Jay Rovang, 50, is a disabled man on a fixed income. He said he got a letter from SSA, stating that it wants to collect benefits it overpaid him totaling $662. ...

A Social Security representative said the agency puts no time limit on collecting overpayments. The representative said it was only recently when Rovang started receiving disability checks that the system was triggered to collect the childhood debt.The letter to Rovang says Social Security will deduct the overpayment from his December disability check, leaving him with $421 for the entire month.