(FILES) In this file photo taken on June 21, 2017 Britain's Prince Charles, Prince of Wales sits and listens as he mother delivers the Queen's Speech during the State Opening of Parliament in the Houses of Parliament in London. - Charles has spent virtually his entire life waiting to succeed his mother, Queen Elizabeth II, even as he took on more of her duties and responsibilities as she aged. But the late monarch's eldest son, 73, made the most of his record-breaking time as the longest-serving heir to the throne by forging his own path. (Photo by Carl Court / POOL / AFP)