Prince Charles is celebrating his 60th birthday and will mark the milestone by promoting a major new charity project. He will attend the launch of Youth Week - a new scheme being run by his Prince's Trust. Celebrations have been held over the last few days for the Prince with the highlight being a glittering dinner hosted by the Queen at Buckingham Palace. Princes William and Harry paid tribute to their father following the celebration describing him as "an inspiration to us and so many others". A comedy gala night was also held on Wednesday to mark the milestone and featured Robin Williams, Rowan Atkinson and Bill Bailey. An official portrait of the Prince has been released to mark his birthday and shows him looking relaxed as he sits in a chair wearing the ceremonial uniform of the Welsh Guards. Charles Philip Arthur George was born on November 14 1948 at Buckingham Palace. After his birth - the first at the royal residence since 1886 - his father Prince Philip drove to Caxton Hall to register the event. As a gift the Queen has allowed a 41-gun salute to be fired at noon to mark the anniversary. London's Hyde Park will echo to the sound of cannons when the King's Troop Royal Horse Artillery fires the volleys close to the Dorchester Hotel - something that will now become a fixture of the unit's calendar. An hour later the Honourable Artillery Company will fire a 62-gun salute at Gun Wharf at the Tower of London. Charles and Camilla will attend the launch of the Prince's Trust's Youth Week at Beckton Community Centre, east London, and meet young people who have been taking part in a skill building team programme. The Youth Week campaign runs for seven days and aims to challenge stereotypes about young people and encourage them to seek help from the trust which provides practical and financial support to 14 to 30-year-olds not in work education or training. Later the royal couple will attend a concert for youngsters staged by the Philharmonia Orchestra and organised by the Prince's Foundation for Children and the Arts.