Philip, later the Duke of Edinburgh, is pictured as a toddler, July 1922. Picture: Getty Images

Philip, aged 25, before his marriage to Princess Elizabeth. Picture: Supplied

Lieutenant Philip Mountbatten and Princess Elizabeth in an engagement picture taken in August, 1947. Picture: Supplied

Elizabeth and Philip at London’s Buckingham Palace after their wedding ceremony in 1947. Picture: Supplied

Prince Philip, Duke of Edinburgh speaks with cricketer Sir Donald (Don) Bradman at Balmoral Castle, 1948. Picture: Supplied

Queen Elizabeth II with Prince Philip at her coronation in June 1953. Picture: Supplied

Prince Philip and Queen Elizabeth sit at Balmoral with their children Princess Anne, left, Prince Charles, right, and the new-born Prince Andrew, centre, playing with a corgi, on September 8, 1960. Picture: AFP

Another family portrait taken in the late 60s. Picture: Supplied

Queen Elizabeth II and Prince Philip arrive in Sydney in 1970. Picture: Supplied

Prince Philip, the Duke of Edinburgh, talks to people in the crowd during his tour of Australia in 1970. Picture: News Ltd

Queen Elizabeth II with Prince Philip, centre, surrounded by children Prince Charles, left, Prince Edward, Prince Andrew (next to Prince Philip) and Princess Anne, far right, for the Queen’s silver wedding anniversary in 1972. Picture: Supplied

Left to right: Prince Philip, Prince William, Earl Spencer, Prince Harry and Prince Charles walk outside Westminster Abbey during the funeral service for Diana, Princess of Wales on September 6, 1997. Picture: AFP

Prince Philip, Duke of Edinburgh, left, discusses the Australian World Cup playing strip with cricketers Steve Waugh, centre, and Shane Warne at Worcester Cricket Club, May 10, 1999. Picture: Supplied

Members of the royal family joined Queen Elizabeth II and Prince Phillip for an official photograph to celebrate the diamond wedding anniversary of the couple at Clarence House in Central London in November 2007. Front row: Prince William, left, Prince Charles; Queen Elizabeth II and Prince Philip; Camilla, Duchess of Cornwall; Prince Harry. Second row (L-R): Vice Admiral Timothy Laurence and his wife the Princess Royal with daughter Zara Philips, Princess Beatrice, Prince Andrew Duke of York, Princess Eugenie, Prince Edward Earl of Wessex and his wife.

The 44th President of the United States, Barack Obama, and his wife Michelle, with Queen Elizabeth and Prince Philip on May 24, 2011, in the Music Room of Buckingham Palace ahead of a State Banquet. Picture: AFP

Left: The royal couple in their youth, walking in the grounds of Broadlands, Hampshire. Right: The couple in 2007. Picture: AFP

Princess Anne and Prince Philip share a joke at the London 2012 Olympic Games at Greenwich Park on July 29, 2012. Picture: Getty Images

The Duke of Edinburgh attends day two of Royal Ascot at Ascot Racecourse on June 18, 2014. Picture: Getty Images

Britain’s Prince Harry, left, salutes as he stands alongside his grandfather Prince Philip, Duke of Edinburgh, during their visit to the Field of Remembrance at Westminster Abbey in central London on November 10, 2016. Picture: AFP

The Duke of Edinburgh opening a new stand at Lord’s cricket ground on May 3rd, 2017. Picture: Twitter/ @RoyalFamily

The Duke of Edinburgh with the new generation of royals. Catherine, Duchess of Cambridge, Meghan, Duchess of Sussex and Prince Harry join Prince Philip to attend the Royal Family's traditional Christmas Day church service in Norfolk on December 25, 2017. Picture: AFP