Supercentenarian Grace Jones has passed away at the age of 113. She will go down in history as the last Briton born in the 19th century to die. Which got us thinking: How many people born in the 1800s are still kicking around? The answer is shockingly few.
In 1997, Jeanne Louise Calment of France died at the age of 122, making her the oldest documented human to have ever lived. But is there something genetically unique about centenarians that enables them to age gracefully and relatively disease-free?