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738,603 people ninety years or older live in France today. These people experience a stage of life at an age at which most people are already dead. Our article aims to question the characteristics of this stage of life in order to determine if the “demographic revolution of longevity” is accompanied by an anthropological change through the addition of a new human life stage. After examining how biomedical research deals with this life stage, we develop our analysis with reference to studies on the lifestyles of nonagenarians and centenarians. It rapidly becomes clear that living at death’s door implies entering a liminal phase of existence, a timeless life.