What is keeping the world’s oldest tortoise going at 194?

A giant tortoise called Jonathan could hold the key to living to 200 years of age, say scientists.Researchers have been conducting genetic tests on Jonathan who, at an estimated 194 years old, is believed to be the world’s oldest living land animal.They say their findings suggest that it’s not just down to good genes, but a lack of genetic wear and tear that have kept him going for nearly two centuries.