Vice President Charles Curtis
Seventy-seven years ago today (1936), 31st Vice President Charles Curtis died of a heart attack, less than three years after retiring from the Vice Presidency. Curtis was 69 years old when he took office, the oldest man to become Vice President to that point (his record was only exceeded by Alben Barkley in 1949). Curtis' 2 years 341 days of retirement is the third shortest of all Vice Presidents who survived to the ends of their terms. He was Vice President under Herbert Hoover, whose 31-plus years of retirement is the longest of all former Presidents.
Surely, you mean after retiring from the Vice Presidency.