Researchers theorize the World's Oldest Person of her time, Jeanne Calment, may have faked her age.
According to HuffPost, Jeanne Calment set an all-time record with the Guinness World Records when she died at 122 years and 164 days old in August 1997. However, Russian researchers believe the woman claiming to be Calment was really her 99-year-old daughter, Yvonne Calment.
In theory, Jeanne Calment died in 1934 and her daughter took her identity so the family wouldn't have to pay inheritance taxes, Inside Edition reports.
They say the relationship between Jeanne and Yvonne's husband, Joseph, seemed strange, too. Joseph never remarried once Yvonne "disappeared," and it's said that he raised their son, Frederic, with Jeanne.
Jeanne Calment also allegedly had most of her personal papers destroyed rather than giving them to the local archives in her town, which researchers suggest implies that she was trying to hide something.
Other researchers offer information that debunks this theory, which you can read about here.