http://blogs.umb.edu/gerontologyinstitute/2020/12/01/elder-index-shows-limits-of-social-security-to-help-older-adults-afford-basic-cost-of-living/

More than half of adults age 65 or older are believed to rely on Social Security for at least 50% of their family income. Nearly a quarter depend on that benefit for 90% or more of their income. But a report from UMass Boston found that, on average, Social Security payments covered only 69.7% of the basic cost of living for an older single renter in good health across the United States. The remaining uncovered annual expenses amounted to $7,850.