Today, George Herbert Walker Bush, father of 43rd President George Walker Bush, becomes the longest-lived Presidential father. Millard Fillmore's father, Nathaniel, had held the record (he died at the age of 91 years 343 days).
The senior President Bush is the second retired President to have his son elected President (after John Adams). Unlike the Adamses, however, improved communication and transportation technologies enabled the first President Bush to attend his son's inauguration and frequently visit him in the White House. Also, the senior President Bush was 76 when his son was inaugurated, while the senior President Adams was nearly 90. George Herbert Walker Bush was born June 12, 1924, and passed John Adams for the #2 spot on this list on February 14, 2015. He is the oldest living President, and number 3 on the list of longest-lived Presidents.