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Britain's Prince Philip, Duke of Edinburgh smiles as he speaks to guests 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 Prince Philip, Duke of Edinburgh smiles as he speaks to guests 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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Britain's Prince Philip, Duke of Edinburgh leaves 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 Prince Philip, Duke of Edinburgh leaves 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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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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AFP JOHN STILLWELL

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Britain's Prince Philip, Duke of Edinburgh leaves 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 Prince Philip, Duke of Edinburgh leaves 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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Queen Elizabeth II and Prince Philip, Duke of Edinburgh smile as they ride in the back of a car after attending the wedding of Lady Palmer and Brigadier Alex Abel Smith at the Queen's Chapel in St James's Palace, London, February 17th 1953. (Photo by Paul Popper/Popperfoto via Getty Images/Getty Images)

Queen Elizabeth II and Prince Philip, Duke of Edinburgh smile as they ride in the back of a car after attending the wedding of Lady Palmer and Brigadier Alex Abel Smith at the Queen's Chapel in St James's Palace, London, February 17th 1953. (Photo by Paul Popper/Popperfoto via Getty Images/Getty Images)
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Popperfoto Paul Popper/Popperfoto