Biden is the first president to turn 79 while in office

Joe Biden became the oldest man to occupy the White House when he was inaugurated earlier this year. Now, he's the first president ever to turn 79 years of age while in office.

Born on November 20, 1942, Mr. Biden's birthday is Saturday.

The day before his birthday, the president had a routine physical, so he went into his birthday weekend with a colonoscopy and his routine physical behind him. White House physician Dr. Kevin O'Connor wrote in a memo that Mr. Biden "remains a healthy, vigorous 78-year-old male who is fit to successfully execute the duties of the Presidency."