Researchers are examining Jonathan's DNA and cellular structure to uncover clues about how he has maintained good health for almost 200 years. Their findings could help improve understanding of ageing and longevity.

Born during queen Victoria's reign: 194-yr old tortoise named Guinness World Records ICON for 2026 - VIDEO

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Born during queen Victoria's reign: 194-yr old tortoise named Guinness World Records ICON for 2026 - VIDEO