Pope Francis was 76 years old when he became pope, an elder statesman in a religion struggling to modernize. Many of the Catholics he counseled were much younger, but he tried to meet them where they were. Often, that meant smiling for a selfie in what became a symbol of his approachable papacy. Social media posts and endearing stories from parishioners and fans over the years have accrued — a 21st-birthday blessing, a toddler who snatched the pope’s headpiece, a mini-me in a cassock — and become part of his legacy. At lively appearances and parades that were sometimes compared to the Olympics or a World Cup, people collected the photos. Even priests and papal missionaries were not immune to asking for a picture.