Jeanne Calment, who holds the record as the world’s oldest person, actually was not that old — and she wasn’t even Jeanne Calment, alleges a researcher who delved into the French woman’s long-accepted claim.

The woman who was reportedly 122 years and 164 days old when she died in 1997 was actually Jeanne Calment’s 99-year-old daughter, says Moscow mathematician Nicolai Zak, according to Agence France-Presse.

The alleged fraudulent claim was the result of the daughter’s attempt to avoid paying inheritance taxes, says Zak, who, with along with gerontologist Valeri Novosselov, studied biographies, interviews, photos and official archives.

Zak’s study was published on the site ResearchGate, an international network for researchers and scientists.

Zak believes that Jeanne Calment died in 1934 and her daughter, Yvonne, took her mother’s identity to avoid paying taxes. The evidence he cited includes an identity card with physical attributes that did not match Jeanne Calment’s.

Members of the Calment family did not respond to the AFP’s request for an interview.

Gerontologist Jean-Marie Robine, who participated in the validation of Calment’s age for the Guinness Book of World Records, told the news agency he “never had any doubt about the authenticity of the documents.” He said Zak’s theory “seems to me defamatory.”

If Calment’s record were to be nullified, the longevity record would be held by the American Sarah Knauss, who died at 119 years in 1999.