Miriam Margolyes has told adult ‘Harry Potter’ fans to grow up. The 82-year-old actress played Professor Sprout in two of the movies based on J.K. Rowling’s book series and Miriam has revealed she “worries” about grown-ups who are still obsessed with the stories because they are “for children”. During an interview with New Zealand’s 1News, she explained: “I worry about ‘Harry Potter’ fans because they should be over that by now. It was 25 years ago and it’s for children. I think it’s for children. But they get stuck in it.” Miriam went on to reveal she often makes personalised videos for fans …