Biden's doctor says after the president's annual checkup that he is still “in a position to fulfill his duty” The results of the routine review are made public at a time when concern is growing about the physical and mental suitability of the president, the oldest in United States history. Biden, who long ago broke the record as the oldest president in the history of the United States, underwent tests this Wednesday at the Walter Reed military hospital, in Bethesda, a suburb of Washington that belongs to the State of Maryland.