Thousands of workers over the age of 100 applied through the U.S. government to verify their employment eligibility in recent years.

It’s not a trend toward an older workforce, but a sign of identity fraud, according to federal auditors.

A recent watchdog review found that at least 6.5 million active Social Security numbers belong to people who are at least 112 years old and likely deceased. Only 35 living individuals worldwide had reached that age as of October 2013, according to the Gerontology Research Group.

The Social Security Administration’s inspector general said in a report on Monday that the questionable identification numbers put the government at risk of fraud and waste.

The review found that one individual opened bank accounts using Social Security numbers for individuals born in 1869 and 1893.

The official database of active Social Security numbers showed that both beneficiaries were alive, meaning they would be older than 145 and 121 years, respectively.

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