Who was the oldest U.S. president?

Unlike for the youngest president of the United States where there is a lower age limit of 35 years old for being president, there’s no upper age limit for holding office. But who was the oldest president of the United States?

Who was the oldest president of the United States?

There are two things to consider when answering this question:

  1. Who was the oldest elected president, i.e. who was the oldest president to take office?
  2. Who was the oldest president to hold office? That is, they may not have been the oldest president when they took office but they became the oldest during their time in office.

The answer to the first question is Donald Trump, who was 70 years and 220 days old when he was inaugurated on January 20th, 2017.

Donald Trump was the oldest president to take office, at 70 years and 220 days of age.

The answer to the second question is Ronald Reagan, who was 77 years and 349 days old when he finally left office on January 20th, 1989.

Ronald Reagan was the oldest president to hold office. He was 77 years and 349 days of age when he left office.

Gerald Ford was the longest-lived president. He died at the age of 93 years and 165 days.

The second longest-lived president was Ronald Reagan who was 93 years and 120 days old when he died.

The oldest surviving president of the United States is George H. Bush who was born on June 12th, 1924.