Social Security celebrates its 90th anniversary today, marking a major milestone for the program that supplies monthly benefit checks to almost 70 million senior citizens, disabled people and surviving family members of deceased workers.

When President Franklin D. Roosevelt signed the Social Security Act into law on Aug. 14, 1935, he guaranteed for the first time that workers could rely on continuing income in retirement after they turned 65. As it enters its 10th decade, the program is only growing in importance amid an aging population, with a record number of Americans now collecting benefits.

In the next 10 years, Social Security is expected to swell by an additional 12 million recipients, according to the AARP . But even as it grows in importance, the program is also facing mo

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