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Longevity claims
Longevity claims are unsubstantiated cases of asserted human longevity. Those asserting lifespans of 110 years or more are referred to as supercentenarians. Many have either no official verification or are backed only by partial evidence. Cases where longevity has been fully verified, according to modern standards of longevity research, are reflected in an established list of supercentenarians based on the work of such international institutions as the Gerontology Research Group (GRG) and/or the ''Guinness World Records''. This article lists claims of 115 years or more.
==Scientific status==
Prior to the nineteenth century, there was insufficient evidence either to demonstrate or to refute centenarian longevity. Even today, no fixed theoretical limit to human longevity is apparent. Studies〔 in the biodemography of human longevity indicate a ''late-life mortality deceleration law'': that death rates level off at advanced ages to a late-life mortality plateau. That is, there is no fixed upper limit to human longevity, or fixed maximum human lifespan. This law was first quantified in 1939, when researchers found that the one-year probability of death at advanced age asymptotically approaches a limit of 44% for women and 54% for men.
Researchers in Denmark have found a way to determine when a person was born based on radio-carbon dating done on the lens of the eye.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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