https://en.wikipedia.org/wiki/List_of_living_former_members_of_the_United_States_Cabinet
Michael Blumenthal - Secretary of the Treasury - January 23, 1977 – August 4, 1979 - January 3, 1926 - 95 years, 101 days
Joseph Califano - Secretary of Health, Education, and Welfare - January 25, 1977 – August 3, 1979 - May 15, 1931 - 89 years, 334 days
Benjamin Civiletti - Attorney General - August 16, 1979 – January 19, 1981 - July 17, 1935 - 85 years, 271 days
Charles Duncan - Secretary of Energy - August 24, 1979 – January 20, 1981 - September 9, 1926 - 94 years, 217 days
Neil Goldschmidt - Secretary of Transportation - August 15, 1979 – January 20, 1981 - June 16, 1940 - 80 years, 302 days
Moon Landrieu - Secretary of Housing and Urban Development - September 24, 1979 – January 20, 1981 - July 23, 1930 - 90 years, 265 days
Ray Marshall - Secretary of Labor - January 27, 1977 – January 20, 1981 - August 22, 1928 - 92 years, 235 days
Edit: Why doesn't the forum allow me to paste the whole bracket in one format?