President Joe Biden has conceded that he may not have had the stamina to last through a second term in office. “So far, so good, but who knows what I’m going to be when I’m 86 years old?” he told USA Today in an interview published Wednesday.

But when asked whether he would have been in a position to serve as president for another four years, Biden conceded he wasn’t sure. “I don’t know,” he told USA Today’s

President Biden acknowledged concerns about his age, stamina and ability to have served a second term in an interview with USA Today in the Oval Office.

Biden told USA Today in an exclusive sit-down interview that he believes he could have won another four years in the White House if he stayed in the race and didn’t bow out and