If the other US presidents had George H W Bush's longevity

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I do not believe that FDR would seek a fifth term in 1948.

And is there not a prohibition against any Secretary General  coming from a nation that is a permanent member of the Security Council, thereby eliminating FDR from becoming Secretary General of the United Nations?

It's an informal policy which probably wasn't around by the time of FDR's death.

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Let's do it for Vice Presidents living till 94

Mike Pence: 1959-2053
Joe Biden: 1942-2036
Dick Cheney: 1941-2035
Al Gore: 1948-2042
Dan Quayle: 1947-2041
Walter Mondale: 1928-2022
Nelson Rockefeller: 1908-2002
Spiro Agnew: 1918-2012
Hubert Humphrey: 1911-2005
Alben W. Barkley: 1877-1971
Henry A. Wallace: 1888-1982
John N. Garner: 1868-1962 (actually died at 98)
Charles Curtis: 1860-1954
Charles G. Dawes: 1865-1959
Thomas R. Marshal: 1854-1948
James S. Sherman: 1855-1949
Charles W. Fairbanks: 1852-1946
Garret Hobart: 1844-1936
Adlai Stevenson I: 1835-1929
Levi P. Morton: 1824-1918 (actually died at 96)
Thomas A. Hendricks: 1819-1913
William A. Wheeler: 1819-1913
Henry Wilson: 1812-1906
Schyler Colfax: 1823-1917
Hannibal Hamlin: 1809-1903
John C. Breckinridge: 1821-1815
William R. King: 1786-1880
George M. Dallas: 1792-1886
Richard M. Johnson: 1780-1874
John C. Calhoun: 1782-1876
Daniel D. Tompkins: 1774-1868
Elbridge Gerry:  1744-1828
George Clinton: 1739-1833
Aaron Burr: 1746-1850

[MASHED POTATOES. VOTE!]

Let's do it for Vice Presidents living till 94

Mike Pence: 1959-2053
Joe Biden: 1942-2036
Dick Cheney: 1941-2035
Al Gore: 1948-2042
Dan Quayle: 1947-2041
Walter Mondale: 1928-2022
Nelson Rockefeller: 1908-2002
Spiro Agnew: 1918-2012
Hubert Humphrey: 1911-2005
Alben W. Barkley: 1877-1971
Henry A. Wallace: 1888-1982
John N. Garner: 1868-1962 (actually died at 98)
Charles Curtis: 1860-1954
Charles G. Dawes: 1865-1959
Thomas R. Marshal: 1854-1948
James S. Sherman: 1855-1949
Charles W. Fairbanks: 1852-1946
Garret Hobart: 1844-1936
Adlai Stevenson I: 1835-1929
Levi P. Morton: 1824-1918 (actually died at 96)
Thomas A. Hendricks: 1819-1913
William A. Wheeler: 1819-1913
Henry Wilson: 1812-1906
Schyler Colfax: 1823-1917
Hannibal Hamlin: 1809-1903
John C. Breckinridge: 1821-1815
William R. King: 1786-1880
George M. Dallas: 1792-1886
Richard M. Johnson: 1780-1874
John C. Calhoun: 1782-1876
Daniel D. Tompkins: 1774-1868
Elbridge Gerry:  1744-1828
George Clinton: 1739-1833
Aaron Burr: 1746-1850

Crazy to imagine Hubert Humphrey and Nelson Rockefeller living so long. It's still funny that Dan "Potatoe" Quayle is younger than Cheney and Biden.

Nelson was pretty unlucky, given his family has a history of longevity.

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The same for losing major party presidential nominees (excluding Vice Presidents, as listed already above)

Hillary Clinton: 1947-2041
Mitt Romney: 1947-2041
John McCain: 1936-1930
John Kerry: 1943-2037
Bob Dole: 1923-2017 (Alive at 95 IRL)
Michael Dukakis: 1933-2027
George McGovern: 1922-2016
Barry Goldwater: 1909-2003
Adlai Stevenson: 1900-1994
Thomas E. Dewey: 1902-1996
Wendell Willkie: 1892-1986
Alf Landon: 1887-1981 (died at 100 IRL)
Al Smith: 1873-1967
John W. Davis: 1973-1967
James M. Cox: 1870-1964
Charles Evans Hughes: 1862-1956
Alton B. Parker: 1852-1946
William Jennings Bryan: 1860-1954
James G. Blaine: 1830-1924
Winfield Scott Hancock: 1824-1918
Samuel J. Tilden: 1814-1908
Horace Greeley: 1811-1905
Horatio Seymour: 1810-1904
George B. McClellan: 1826-1920
Stephen A. Douglas: 1813-1907
John C. Fremont: 1813-1907
Winfield Scott: 1786-1880
Lewis Cass: 1782-1876
(skipping 1826 because of all candidates belonging to the same party)
Rufus King: 1755-1849
DeWitt Clinton: 1769-1863
Charles C. Pinckney: 1746-1840


Major third party candidates:

Ross Perot: 1930-2024
George Wallace: 1919-2013
Strom Thurmond: 1902-1996 (died at 100 IRL)
Robert M. La Follette: 1855-1949
James B. Weaver: 1833-1927
John Bell: 1796-1890
William Wirt: 1772-1866
John Floyd: 1783-1877