'This 20th century U.S. president lived the longest amount of time after his term as president:  31 years, 231 days'
Herbert Hoover (lived to age 90 in 1964)
AFTER THE PRESIDENCY: This 20th century U.S. president lived the longest amount of time after his term as president:  31 years, 231 days
This 20th century U.S. president lived the longest amount of time after his term as president:  31 years, 231 days
This 20th century U.S. president lived the longest amount of time after his term as president:  31 years, 231 days
AFTER THE PRESIDENCY
Herbert Hoover lived to age 90 in 1964
AFTER THE PRESIDENCY