HEADLINES & GLOBAL NEWS By (Photo : Adam Davy - Pool/Getty Images) Reports about Prince Philip's cause of death is old age at the age of 99, as the royal family did not add more about the passing of Queen Elizabeth's husband. Prince Philip cause of death mention but no more details On April 9, the Duke of Edinburgh died at Windsor Castle, said Buckingham Palace, and no private information was published about the prince's passing, reported The Sun. According to the Telegraph, the death certificate of the prince declared that he died of advanced age, based on the document. Sir Huw Thomas, t...