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Why do turtles live for so long?
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A green sea turtle swims above a sandy, grassy seabed in clear blue water near Puerto Rico. Diagram comparing the plastron and carapace in terrestrial and marine turtles, showing labeled illustrations of a turtle's ventral and dorsal shells and a skeletal view highlighting the relationship between the shells and axial skeleton.
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A green sea turtle swims above a sandy, grassy seabed in clear blue water near Puerto Rico.
Sea turtle A green sea turtle cruising through the waters off the coast of Puerto Rico.

Why do turtles live for so long?

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Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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Turtles are known for their long lifespans, with some species such as the Blanding’s turtle (Emydoidea blandingii) and the eastern box turtle (Terrapene carolina) living more than 30 years. Their ability to live so long comes from a mix of physical and biological traits.

Turtles have evolved a range of adaptations that contribute to their long lives. One reason turtles live a long time is their slow metabolism. A reduced metabolic rate helps limit physical strain on the body, slowing down the effects of aging and wear over time. It also allows them to use energy more efficiently, go longer without food, and limit damage to their cells—factors that may help slow aging.

Diagram comparing the plastron and carapace in terrestrial and marine turtles, showing labeled illustrations of a turtle's ventral and dorsal shells and a skeletal view highlighting the relationship between the shells and axial skeleton.
Anatomy of a turtle shellTurtle shells are formed from bones, with the top (the carapace) and the bottom (the plastron) fused for protection.

A turtle’s shell also plays a big role in helping it live longer. The bony shell, made up of a top part called the carapace (the hard, domed upper shell) and a bottom part called the plastron (the flat lower shell that covers the belly), acts like natural armor. It protects turtles from death and injuries. This physical adaptation is beneficial for species that live in environments with many predators.

Turtles develop at a slow pace and often need many years to reach reproductive maturity. This delayed development is also linked to longer lifespans. Once mature, turtles tend to have lower death rates, which also adds to their longevity. By focusing on survival first and reproduction later, turtles have adapted to live long lives.

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