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Back in 1965, a 90-year-old French woman named Jeanne Calment signed a “reverse mortgage" deal with her lawyer, a guy named André-François Raffray. In exchange for ownership of her luxurious Parisian apartment, Raffray—then aged 47—agreed to pay Mme Calment 2,500 francs a month and let her live there until she died. It sounded like he’d made a good bet, but unfortunately for the lawyer, he didn’t know that he'd signed a contract with the woman who would go on to become the oldest recorded per...