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Although some scientists caution against any sweeping conclusions, many say the new data are important and striking. Scientists have long noted that naked mole rats—burrowing rodents with wrinkled, pink skin and large protruding teeth that live in large, subterranean colonies—show few signs of aging and far surpass the life span expected of a rodent this size. More—and older—mole rats are needed to be sure that the risk of dying really is flat, Finch argues. But perhaps their greatest feat, a new paper suggests, is that they don't age. For each animal in her care, she recorded the date of birth and when it died, and whether it was killed for an experiment or given away to other researchers.

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Avery. Age: 20.
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Even Rochelle Buffenstein does not have the data on this.

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Natalia. Age: 22.
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Naked mole rats defy the biological law of aging

Indeed, the big mystery now is what happens in naked mole rats after 20 or 30 years, says Matthias Platzer, a biologist at the Leibniz Institute on Aging in Jena, Germany. But Buffenstein did not see this trend in her lab animals. For each animal in her care, she recorded the date of birth and when it died, and whether it was killed for an experiment or given away to other researchers. More—and older—mole rats are needed to be sure that the risk of dying really is flat, Finch argues.

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