Pope shows lifetime jobs aren’t always for life

FILE - In this Thursday, March 25, 2010 file photo Pope Benedict XVI gestures from his popemobile as he leaves a youth gathering, in St. Peter's square, at the Vatican. When he became pope at age 78, Benedict XVI was already the oldest pontiff elected in nearly 300 years. He's now 85, and in recent years he has slowed down significantly, cutting back his foreign travel and limiting his audiences. (AP Photo/Gregorio Borgia)The world seems surprised that an 85-year-old globe-trotting pope who just started tweeting wants to resign, but should it be? Maybe what should be surprising is that more leaders his age do not, considering the toll aging takes on bodies and minds amid a culture of constant communication and change.