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Britain's Prince Philip, Duke of Edinburgh (L) and Britain's Queen Elizabeth II arrive at Chapel Royal in St James's Palace in London, for an Order of Merit service on May 4, 2017. Britain's Prince Philip, the 95-year-old husband of Queen Elizabeth II, will retire from public engagements later this year, Buckingham Palace said Thursday. The Duke of Edinburgh, who turns 96 on June 10, is the longest-serving consort in British history, and is still in good health. / AFP PHOTO / POOL / John Stillwell (Photo credit should read JOHN STILLWELL/AFP/Getty Images)

Britain's Prince Philip, Duke of Edinburgh (L) and Britain's Queen Elizabeth II arrive at Chapel Royal in St James's Palace in London, for an Order of Merit service on May 4, 2017. Britain's Prince Philip, the 95-year-old husband of Queen Elizabeth II, will retire from public engagements later this year, Buckingham Palace said Thursday. The Duke of Edinburgh, who turns 96 on June 10, is the longest-serving consort in British history, and is still in good health. / AFP PHOTO / POOL / John Stillwell (Photo credit should read JOHN STILLWELL/AFP/Getty Images)
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LONDON, ENGLAND - MAY 4: The Order of Merit members pose for a group photograph (left to right back row) , Sir James Dyson, Lord Darzi of Denham, David Hockney, Neil MacGregor, The Rt Hon Jean Chretien, Sir Tim Berners-Lee, Lord Rees of Ludlow, John Howard, Professor Sir Magdi Yacoub, Professor Dame Ann Dowling, Lord Robert Fellowes, (left to right seated) Sir David Attenborough, Lord Rothschild, Professor Lord May of Oxford, Professor Sir Roger Penrose, Sir Michael Atiyah, Prince Phillip the Duke of Edinburgh, Queen Elizabeth II, Lord Foster of Thames Bank, Sir Tom Stoppard, Baroness Boothroyd, Professor Sir Michael Howard and Lord Eames, after attending attending the Order of Merit service at Chapel Royal on May 4, 2017 in St James's Palace, London. (Photo by John Stillwell - WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 4: The Order of Merit members pose for a group photograph (left to right back row) , Sir James Dyson, Lord Darzi of Denham, David Hockney, Neil MacGregor, The Rt Hon Jean Chretien, Sir Tim Berners-Lee, Lord Rees of Ludlow, John Howard, Professor Sir Magdi Yacoub, Professor Dame Ann Dowling, Lord Robert Fellowes, (left to right seated) Sir David Attenborough, Lord Rothschild, Professor Lord May of Oxford, Professor Sir Roger Penrose, Sir Michael Atiyah, Prince Phillip the Duke of Edinburgh, Queen Elizabeth II, Lord Foster of Thames Bank, Sir Tom Stoppard, Baroness Boothroyd, Professor Sir Michael Howard and Lord Eames, after attending attending the Order of Merit service at Chapel Royal on May 4, 2017 in St James's Palace, London. (Photo by John Stillwell - WPA Pool/Getty Images)
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LONDON, ENGLAND - MAY 04: Queen Elizabeth II and Prince Philip, Duke of Edinburgh arrive at St James's Palace for a service for members of The Order of The Merit at St James's Palace on May 4, 2017 in London, England. Buckingham Palace today announced the Duke of Edinburgh is to retire from Royal duties and will no longer carry out public engagements from the autumn of 2017. (Photo by John Stillwell - WPA Pool /Getty Images)

LONDON, ENGLAND - MAY 04: Queen Elizabeth II and Prince Philip, Duke of Edinburgh arrive at St James's Palace for a service for members of The Order of The Merit at St James's Palace on May 4, 2017 in London, England. Buckingham Palace today announced the Duke of Edinburgh is to retire from Royal duties and will no longer carry out public engagements from the autumn of 2017. (Photo by John Stillwell - WPA Pool /Getty Images)
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LONDON, ENGLAND - MAY 04: Queen Elizabeth II, Prince Philip, Duke of Edinburgh and Revd Canon Paul Wright leave St James's Palace after a service for members of The Order of The Merit at St James's Palace on May 4, 2017 in London, England. Buckingham Palace today announced the Duke of Edinburgh is to retire from Royal duties and will no longer carry out public engagements from the autumn of 2017. (Photo by John Stillwell - WPA Pool /Getty Images)

LONDON, ENGLAND - MAY 04: Queen Elizabeth II, Prince Philip, Duke of Edinburgh and Revd Canon Paul Wright leave St James's Palace after a service for members of The Order of The Merit at St James's Palace on May 4, 2017 in London, England. Buckingham Palace today announced the Duke of Edinburgh is to retire from Royal duties and will no longer carry out public engagements from the autumn of 2017. (Photo by John Stillwell - WPA Pool /Getty Images)
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Britain's Queen Elizabeth II and Britain's Prince Philip, Duke of Edinburgh (C) leave with Revd Canon Paul Wright (R) after attending an Order of Merit service at Chapel Royal in St James's Palace in London, on May 4, 2017. Britain's Prince Philip, the 95-year-old husband of Queen Elizabeth II, will retire from public engagements later this year, Buckingham Palace said Thursday. The Duke of Edinburgh, who turns 96 on June 10, is the longest-serving consort in British history, and is still in good health. / AFP PHOTO / POOL / John Stillwell (Photo credit should read JOHN STILLWELL/AFP/Getty Images)

Britain's Queen Elizabeth II and Britain's Prince Philip, Duke of Edinburgh (C) leave with Revd Canon Paul Wright (R) after attending an Order of Merit service at Chapel Royal in St James's Palace in London, on May 4, 2017. Britain's Prince Philip, the 95-year-old husband of Queen Elizabeth II, will retire from public engagements later this year, Buckingham Palace said Thursday. The Duke of Edinburgh, who turns 96 on June 10, is the longest-serving consort in British history, and is still in good health. / AFP PHOTO / POOL / John Stillwell (Photo credit should read JOHN STILLWELL/AFP/Getty Images)
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