FILE - In this Sunday, Oct. 2, 2016 file photo, Denmark's Queen Margrethe II looks up before she plants a tree in the Luther Garden in Wittenberg, Germany. While the announcement on Thursday, May 4, 2017 of Britain’s Prince Philip’s plan to retire in the fall came as a surprise, for some of the world’s royal families easing out of the public eye is seen as a normal way of ending their public service and handing the reins to a new generation. For others, being a royal really is a job for life. On Dec. 31, 2015, Denmark's Queen Margrethe said in her traditional News Year's speech that her French-born husband, Prince Henrik, would retire from most official duties at the age of 81. (AP Photo/Jens Meyer, file)