List of presidents of the United States by age

In this list of presidents of the United States by age, the first table charts the age of each president of the United States at the time of presidential inauguration (first inauguration if elected to multiple and consecutive terms), upon leaving office, and at the time of death. Where the president is still living, their lifespan and post-presidency timespan are calculated as of.

Age of presidents
Article Two of the United States Constitution provides that U.S. presidents must be at least 35 years old at the time of taking office. The median age at inauguration of incoming U.S. presidents is 55 years. The youngest person to become U.S. president was Theodore Roosevelt, who, at age 42, succeeded to the office after the assassination of William McKinley. The oldest person inaugurated president was Joe Biden, at the age of 78.

Assassinated at age 46, John F. Kennedy was the youngest president at the end of his tenure, and his lifespan was the shortest of any president. At age 50, Theodore Roosevelt was the youngest person to become a former president. The oldest president at the end of his tenure was Ronald Reagan at 77; this distinction will eventually fall upon Joe Biden, who is currently 81 years.

James K. Polk had the shortest retirement of any president, dying of cholera only 103 days days after leaving office, at the age of 53 (the youngest president to die of natural causes). Jimmy Carter's retirement, currently 43 years, is the longest in American presidential history. Additionally, at age 99, Carter is the oldest of the six living U.S. presidents as well as the nation's longest-lived president. Barack Obama, at age 62, is the youngest living former president.

Graphical representation
This is a graphical lifespan timeline of the presidents of the United States. They are listed in order of office, with Grover Cleveland listed in the order of his first presidency.

The following chart shows presidents by their age (living presidents in green), with the years of their presidency in blue. The vertical blue line at 35 years indicates the minimum age to be president.