The secret to long life might be found in the Amazon.
Survival International, an indigenous rights organization, is claiming that Maria Lucimar Pereira is preparing to celebrate what some claim is her 121st birthday -- an achievement that would make her the world's oldest person.
Pereira, a member of the Kaxinawa tribe, speaks only her tribal language, reports The International Business Times.
Pereira maintains a healthy lifestyle by consuming a diet of fresh fish, banana porridge, root vegetables, and grilled meat, but she also avoids salt, sugar and processed foods, reports Care2.com.
Survivors International director Stephen Corry told Care2.com, "All too often we witness the negative effects forced change can have on indigenous peoples.
"It’s refreshing to see a community that has retained strong links to its ancestral land and enjoyed the undeniable benefits of this," he said.
Guinness is aware of Pereira's claim but remains unconvinced at this point that her age can be verified.
"There's no early-life proof of birth documentation which we require," a Guinness representative told The Huffington Post.
"This doesn't necessarily mean a birth certificate but even a census report."
According to the International Business Times, Brazilian officials accidentally discovered Pereira's age in a birth certificate check and are still trying to verify through social workers if there were any mistakes in the documentation.
Until Guinness revisits the issue, Cooper will retain her title.
Cooper's secret to long life: "I mind my own business," she says. "And I don't eat junk food."
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