Amanda Andrade-Rhoades/For The Washington Post via Getty Images
- Joe Biden's physician pronounced him a 'healthy, vigorous, 80-year-old male' in a new health summary.
- Biden has faced questions about his age as the oldest sitting president in history.
- The White House says he keeps up with a "grueling schedule" and is up to the job.
President Joe Biden's physician pronounced him a "healthy, vigorous, 80-year-old male" who is "fit for duty," according to a new health summary released by the White House on Thursday.