Jonathan the tortoise was born around 1832 — before the lightbulb, before the telephone, before the postage stamp. At an estimated 194 years old, he is the oldest known living land animal on Earth and the oldest chelonian ever recorded, according to Guinness World Records, which recently elevated him to official Icon status. His longevity isn’t a mystery anymore: it comes down to extraordinary genetics, a metabolism that runs in slow motion, and a weekly hand-fed feast on the island of St. Helena.
The Tortoise Who Outlived 40 U.S. Presidents
Jonathan arrived on St. Helena — the same remote South Atlantic island where Napoleon Bonaparte spent his final years — in 1882, as a gift to the island’s governor. Shipping records and photographs from his arrival confirm he was already fully mature at the time. Because Seychelles giant tortoises take roughly 50 years to reach full maturity, scientists place his birth year conservatively at 1832. He could be older. The previous record holder, Tu’i Malila, a Tongan tortoise, died in 1966 at approximately 189 years — Jonathan has already surpassed that mark.
Today he lives on the manicured lawns of Plantation House, the official governor’s residence, sharing a paddock with three other giant tortoises: David, Emma, and Frederik. He is blind from cataracts and has lost his sense of smell, but his hearing is sharp — he recognizes the voice of his primary veterinarian, Dr. Joe Hollins, and walks over when he hears him call. He also appears on the back of the island’s 5-pence coin, which says everything about how St. Helena feels about him. Much like other animals that have become cultural symbols, Jonathan’s fame has grown far beyond his species.
Why Jonathan’s Cells Don’t Age Like Yours
Scientists didn’t just admire Jonathan from a distance. They took DNA swabs from him to study what his genetics might teach us about human aging. What they found is legitimately remarkable.
Giant tortoises carry duplicated versions of tumor-suppressor genes — meaning if a cell begins mutating dangerously, the body flags it and shuts it down faster than almost any other animal. When cells are already damaged beyond repair, Jonathan’s body doesn’t attempt a half-hearted fix: it triggers a rapid form of programmed cell death called apoptosis, eliminating the threat before it compounds. The result is an animal that is, at a molecular level, nearly immune to cancer. Researchers also found that his mitochondrial energy production remains unusually stable — his cells, essentially, don’t forget how to function properly as they age.
Layer that on top of an exceptionally slow metabolism — one that burns energy at a fraction of the rate a mammal does — and Jonathan’s internal engine produces far fewer free radicals, the unstable molecules generated by burning fuel that gradually damage DNA and accelerate aging. He is, quite literally, pacing himself through centuries.
The Sunday Feast That Brought Him Back From the Brink
A few years ago, Jonathan was in genuine decline. Blind and unable to smell, he could no longer find enough nutrients by grazing on lawn grass. His beak had gone soft, dry, and crumbly — a serious problem for an animal that relies on it to eat.
Dr. Joe Hollins intervened with a deceptively simple fix: every single week, he hand-feeds Jonathan a dense bucket of high-calorie produce. The menu includes apples, carrots, cucumbers, cabbage, and — his clear favorite — bananas, which he eats skin and all with what Hollins describes as barely contained enthusiasm. The spike in vitamins and trace minerals completely reversed his decline. The keratin in his beak hardened back up into a sharp, healthy edge, and his energy returned.
Add in the absence of any natural predators on St. Helena, a mild Atlantic climate, and nearly 150 years of uninterrupted residence on the same quiet lawn, and Jonathan’s situation amounts to something almost unfair: possibly the most comfortable retirement in the animal kingdom. Scientists keep studying him. The island keeps celebrating him. And every Sunday, without fail, Dr. Hollins shows up with a bucket of bananas.
