Joe Biden, who became the oldest U.S. president on the day he entered office, had a chance to become a very consequential one-termer. One-third of the way through his term, it is evident he is not taking that path. One indication, but not the only one, is that he reportedly wants to run for re-election. Age alone is sufficient reason this prospect gives Biden’s supporters pause. If Biden were to serve a full second term, he would be eighty-six at the end of it. For comparison, the next oldest U.S. president was Ronald Reagan, who was seventy-seven when he left office.
