Pope Francis has said his recent trip to Canada showed he may one day need to retire if his health fails him. Although he was recently forced to deny rumours that he was about to step down, the 85-year-old Catholic leader has previously left open the possibility of some day retiring, and spent much of his Canadian visit using a wheelchair.
Francis would be only the third pope in history to retire, but the second in a row. The resignation of Pope Benedict in 2013 caught the assembled cardinals off guard.
