- Animals - Reptiles - Turtles & Tortoises ## Scientists discover the genetic secrets that may have helped Jonathan the tortoise live to 194 years old DNA samples from Jonathan the 194-year-old tortoise reveal gene variants and epigenetic changes that could contribute to his remarkable lifespan. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. - Copy link - Facebook - Reddit - Pinterest - Flipboard The remote south Atlantic island of St. Helena boasts an international celebrity: the tortoise Jonathan, the oldest living land animal. At 194…