The analysis of all these documents led me to the conclusion that the daughter of Jeanne Calment, Yvonne, took the identity of her mother," said Mr. Zak, interviewed by AFP. Mr. Zak, a member of the Society of Naturalists (MOIP) of the Moscow University, recently published his study "Jeanne Calment: the secret of longevity" on, an international network (ResearchGate) for researchers and scientists. The Russian researcher estimates that in 1934 it was not the only daughter of Jeanne Calment, Yvonne, who died of pleurisy, as the official version says, but Jeanne Calment herself. Yvonne would have borrowed the identity of the mother, which would have avoided paying the inheritance tax. Therefore, she is believed to have died in 1997 at the age of 99.
After the death of Jeanne Calment, scientists had already raised red flags that no autopsy was conducted to explain the exceptional longevity of the alleged centenarian, who moreover indulged in her inclinations for chocolate and port and smoked cigarettes before health deterioration. Feeding the doubts, Jeanne Calment ordered to burn some of her photo archives when she became famous.
Mr. Zak had the idea to investigate the life of Jeanne Calment during the creation of a "mathematical model" of the lifespan of supercentenaries: "The more I searched, the more I discovered contradictions". He finds a 1997 book, "Insurance and its secrets", with a small passage devoted to Jeanne Calment that raises the hypothesis of an exchange of identities between mother and daughter.
Further, Russians have no skin in the game, as it would give the record to the "hated" USA people.
https://www.afp.com/fr/infos/334/la-longevite-de-jeanne-calment-mise-en-doute-par-des-scientifiques-russes-doc-1bw6b92https://www.researchgate.net/publication/329773795_Jeanne_Calment_the_secret_of_longevity