CentralNotice From Wikipedia, the free encyclopedia Jump to: navigation , search This is a list of Presidents of the United States by age . The first table charts the age of each United States President at the time of their presidential inauguration (first inauguration if they were elected to multiple and consecutive terms), at the time they left office, and at the time of their death. Each president's lifespan (age at death) is measured in two ways, to allow for the differing number of leap days that each experienced. The first figure is the number of days between date of birth and date of death, allowing for leap days; in parentheses the same period given in years and days, with the years being the number of whole years that the President lived, and the days being the number of days since the last birthday. Where the president is still living, lifespan is calculated u...