President Joe Biden on Friday stumbled several times while climbing the stairs to board Air Force One, but a White House aide said he didn’t require medical attention. Biden, 78, the oldest president in history, fell as he was about halfway up the steps. He regained his footing but stumbled again, eventually needing to place his left knee on a step as he tried to right himself. Biden ultimately made it up the stairway. He turned around and saluted before entering the plane. “I know folks have seen that President Biden slipped on his way up the stairs to AF1, but I’m happy to report that he is just fine and did not even require any attention from the medical team who travels with him. Nothing more than a misstep on the stairs,” White House communications director Kate Bedingfield said in a social media statement. “It’s pretty windy outside. It’s …