William TURNS 40!

On his birthday, Prince William opens up about lessons he's learned and his plans for the future

- Prince William

Prince William was in a reflective mood. "I was 11 when I first visited a homeless shelter with my mother, who in her own inimitable style was determined to shine a light on an overlooked, misunderstood problem," he said of his late mother, Princess Diana, in a new interview on June 20, the day before his 40th birthday. "I have always believed in using my platform to bring attention and action to those who are struggling. I plan to do that now I'm turning 40, even more than I have in the past."

That's just one of many goals the future king has set for himself in this milestone year. "Turning 40 has really resonated with Prince William. He sees it as a new chapter in his life, and he's determined to heed the lessons he's learned up until now," says a source. The biggest one? Balancing family and duty. As he takes on more royal responsibilities from the queen, William is not only trying to repair his fractured relationship with his brother, Prince Harry, says the source, but he's also moving his wife, Kate Middleton, 40, and kids, George, Charlotte, and Louis, to a new home "so he can be even more present as a husband and father. William knows he's made a lot of mistakes over the years, and he's hoping not to repeat them."

MOVING ON FROM SCANDAL