Prince William will celebrate his birthday on Sunday (Picture: Getty Images) Prince William turns 44 this weekend, and as we did in January with his wife, Kate Middleton, we’ve taken a trip down memory lane. So, for those nosy about what William was like in his younger years, you’ve come to the right place. Jack Stooks, a former royal gardener who worked for the royal family for over two decades, has shared some insight about the future King. Sp…