Author: Sean Williams, The Motley Fool

Over the next decade, the Social Security program will pocket an estimated $804.4 billion in interest income from the federal government.

The question folks are asking about Social Security, given its many problems, is when, exactly, will it run out of cash? The honest answer: Never.

Despite a strong U.S. economy and a low unemployment rate, trouble could be right around the corner. Here are the signs to watch out for.