How Old Is Jonathan the Tortoise, and Why Is He Still Alive?

Jonathan hatched around 1832 — Guinness now says possibly before that. His species averages 150 years. He’s already 40+ years past that mark and still mating.

Jonathan, a Seychelles giant tortoise living on Saint Helena island in the South Atlantic, is the oldest known living land animal on Earth. He hatched around 1832 — possibly earlier — which means he has been alive for at least 193 years as of 2026. Guinness World Records describes 1832 as a conservative minimum, not a firm date.

He arrived at Saint Helena in 1882 as a gift to the island’s governor, already a fully grown adult. Experts estimated his age at arrival by reading his shell size. Seychelles giant tortoises reach full growth around 50 years old, so researchers subtracted 50 years from 1882 and landed on circa 1832.

What Jonathan Has Outlived

Photography as a technology dates to 1838. The incandescent lightbulb arrived around 1878. Powered flight began in 1903. Jonathan predates all of it. Smithsonian notes his lifespan covers Andrew Jackson’s second inauguration in 1833 and 39 additional U.S. presidential inaugurations since then. Both World Wars — 1914–1918 and 1939–1945 — fall entirely within his lifetime.

He now appears on Saint Helena’s 5-pence coin. A tortoise outlasting empires, wars, and technologies is the kind of fact that stops a reader cold.

Jonathan’s Biology at 190-Plus Years

Despite being blind from cataracts and having lost his sense of smell, Jonathan still sunbathes, eats, and mates. Caretakers hand-feed him carrots, cabbage, bananas, and guavas at Plantation House. His managed diet and protection from predators almost certainly contribute to his survival well past his species’ typical ceiling.

General chelonian biology points to slow metabolic rates and robust cellular maintenance as the foundation of giant tortoise longevity. However, the specific genetic or cellular mechanisms behind Jonathan’s individual outlier status haven’t been detailed in the scientific literature reviewed here. He is an extreme data point — not yet fully explained.

Why His Age Is an Estimate, Not a Fact

No hatch record exists. The 1832 figure comes entirely from the inference that a fully grown tortoise in 1882 must have been at least 50 years old. Guinness now uses the phrasing “before 1832” to signal that 1832 is a floor, not a known birth year. Different publications quote slightly different ages depending on whether they use 1832 or an earlier baseline, but every source agrees he is over 190 years old.

Jonathan is the only confirmed member of his species living outside any native range, in a human-managed garden, setting records no wild animal could easily replicate. The oldest known living land animal is eating breakfast on a British island this morning.