[Answer] Which animal doesn't age?

Step 1 : Introduction to the question " Which animal doesn't age? "

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In the world of animal models, naked mole rats are the supermodels. They rarely get cancer, are resistant to some types of pain, and can survive up to 18 minutes without oxygen. But perhaps their greatest feat, a new paper suggests, is that they don't age.

The first study to analyze the life histories of thousands of naked mole rats has found that their risk of death doesn't go up as they grow older, as it does for every other known mammalian species.

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. Mice in captivity live at most 4 years; based on their size, naked mole rats would not be expected to live past 6 years. Instead, some live beyond 30 years, and even at that age breeding females stay fertile.

Studies have shown that naked mole rats have very active DNA repair and high levels of chaperones, proteins that help other proteins fold correctly.

More Info: www.science.org

Step 2 : Answer to the question " Which animal doesn't age? "

Leopard:

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