Gerald Ford. He lived to 93 years and 165 days.
Ronald Reagan comes in a close second, living to 93 years and 120 days.
Herbert Hoover
Ford
Gerald Rudolph Ford, Jr. (1913-2006)
Franklin D Roosevelt
Franklin D. Roosevelt
Franklin delano Roosevelt from 1933-1945
Gerald Ford was the 38th President of the United States, and died of natural causes (primarily arteriosclerosis) at the age of 93 in 2006. At the time, he had lived longer than any other US president.
There's has never been a United States President whose presidency lasted for twelve years longer than any other US President. Franklin Roosevelt's presidency lasted for 12 years, but that was, at most, only 4 years longer than any other President's.
Assuming you mean US presidents, the answer would be Franklin D. Roosevelt.
The oldest president when he died was Gerald Ford who passed away at the age of 93.
He served longer than any other president.
FDR was the 32nd president, he served during the Great Depression and World War II, he served longer than any other president and he is probably second only to President Lincoln in terms of popularity.