John Tyler, the 10th President of the United States of America, was born in 1790 and in office from 1841 to 1845. Remarkably, two of his grandsons are still alive.
One of them, Harrison Tyler, explains how this has come about in an interview with the magazine:
"Both my grandfather - the president - and my father, were married twice. And they had children by their first wives. And their first wives died, and they married again and had more children. And my father was 75 when I was born, his father was 63 when he was born."