What if I told you that a tortoise named Jonathan, who holds the Guinness World Record for the oldest living land animal, is 191 years old? While the cosmetic industry races to develop the latest anti-aging products, Jonathan appears to possess the true secret to long life. This phenomenon is known as negligible senescence. What if I told you that a tortoise named Jonathan, who holds the Guinness World Record for the oldest living land animal, is 191 years old? While the cosmetic industry races to develop the latest anti-aging products, Jonathan appears to possess the true secret to long life. This phenomenon is known as negligible senescence. Children Health News, Wellbeing Tips, Diseases, Treatment and Nutrition | The Hindu