People in their 80s lead countries, create majestic art and perform feats of endurance. One entered the record books for scaling Mount Everest. It's soon time for Joe Biden, 80 on Sunday, to decide whether he has one more mountain to climb — the one to a second term as president.
Questions swirl now, in his own party as well as broadly in the country, about whether he's got what it takes to go for the summit again.
