Prince Harry turns 40 on Sunday, September 15, and the Duke of Sussex is looking forward to the new decade of life despite his ongoing rift with the royal family. “I was anxious about 30, I’m excited about 40,” the Duke of Sussex told the BBC in a statement. “Whatever the age, my mission is to continue showing up and doing good in the world.” For Harry’s special day, he’s expected to have a small gathering in California. “Becoming a father of two incredibly kind and funny kids has given me a fresh perspective on life, as well as sharpening my focus in all my work,” Harry continued. “Being a da…