There are three ways to die: of injury, disease, or old age. Over time, humans have gotten better at avoiding the first two, but as we get older, senescence—the gradual deterioration of bodily functions with age—is inevitable. Some species seem to do better than others, though: Take the hydra, a tiny freshwater creature that some scientists have deemed potentially immortal. Last year, a naked mole rat made headlines for turning 39, five times the typical lifespan for similarly sized rodents. And just a few months ago, a giant Aldabra tortoise named Jonathan celebrated what was believed to be his 190th birthday,
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