Photo 1 of 10 WINDSOR, UNITED KINGDOM - MARCH 24: Queen Elizabeth ll and Prince Philip, Duke of Edinburgh attend the Royal Maundy Service at Windsor Castle on March 24, 2016 in London, England. (Photo by Anwar Hussein/WireImage)
Photo 2 of 10 Queen Elizabeth II, as Princess Elizabeth, and her husband the Duke of Edinburgh, styled Prince Philip in 1957, on their wedding day. She became queen on her father King George VI's death in 1952. (Photo by Hulton Archive/Getty Images)
Photo 3 of 10 Queen Elizabeth II with a group of local children during her state visit to Mexico, February-March 1975. (Photo by Serge Lemoine/Hulton Archive/Getty Images)
Photo 4 of 10 Queen Elizabeth II, Fiji, 30th October 1982. (Photo by John Shelley Collection/Avalon/Getty Images)
Photo 5 of 10 The Prince and Princess of Wales pose on the balcony of Buckingham Palace on their wedding day, with the Queen and some of the bridesmaids, 29th July 1981. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
Photo 6 of 10 ASCOT, ENGLAND - JUNE 16: Queen Elizabeth II and Prince Philip, Duke of Edinburgh on day 1 of Royal Ascot at Ascot Racecourse on June 16, 2015 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
Photo 7 of 10 The Queen during the 1966 State Opening of Parliament. (Photo by © Hulton-Deutsch Collection/CORBIS/Corbis via Getty Images)
Photo 8 of 10 Britain's Queen Elizabeth II (L) prepares to deliver the Queen's Speech from the throne in the House of Lords next to Prince Philip, Duke of Edinburgh (R) during the State Opening of Parliament at the Palace of Westminster in London on May 27, 2015. The State Opening of Parliament marks the formal start of the parliamentary year and the Queen's Speech sets out the governmentâs agenda for the coming session. AFP PHOTO / POOL / BEN STANSALL
Photo 9 of 10 LONDON, UNITED KINGDOM - JUNE 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II attends a national service of thanksgiving to mark her 90th birthday at St Paul's Cathedral on June 10, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
Photo 10 of 10 WINDSOR, UNITED KINGDOM - MAY 19: Queen Elizabeth II talks with Prince Philip, Duke of Edinburgh after the wedding of Prince Harry and Meghan Markle at St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Alastair Grant - WPA Pool/Getty Images)