Prince William, who is due to turn 40 this week, is expected to take on the role of Prince of Wales as soon as his father, Prince Charles, ascends the British throne and a source close to him has leaked that “life it is up to him to change to a great extent “. According to the source: “He will be the head of the Duchy of Cornwall, a billion-pound business empire, and will be expected to make many more royal commitments, especially abroad.” However, a Cambridge friend revealed: “William and Kate are in the happiest time of their lives right now, before the weight of the world falls on their shoulders. “They try not to think about what lies ahead.” Kate and William are also expected to make a big move this summer, with the family uprooted from Kensington Palace for the Adelaide Cottage on the Windsor estate.