80) Harrison Ruffin Tyler

Harrison (Left) with older brother Lyon (Right)

80) Harrison Ruffin Tyler

Surviving grandson of 10th US President John Tyler

Born: 1928

The 10th United States President had fifteen children between his two wives and died a solid sixty years before his youngest grandchildren (including Lyon Jr and Harrison) were born.

Harrison reportedly still lives at the Sherwood Forest Plantation, the historic home belonging to the Tyler Family. His father was seventy-five years old when he was born.

Sources:

https://allthatsinteresting.com/john-tyler-still-has-two-living-grandkids

https://www.cbsnews.com/news/how-two-of-president-john-tylers-grandsons-are-still-alive/