One of the most exciting things about the films would be to see the cast throughout the seven films, and to see them grow throughout their years at Hogwarts. That may be a pipe dream, that may not be possible, but it would be, from a cinematic point of view, very exciting. You would actually see Harry Potter grow from an eleven year old into a seventeen year old.
Chris Columbus during the filming of Philosopher’s Stone (Capturing the Stone: A Conversation with the Filmakers)
“I was very well-educated. My dad paid for me to go to a very good school but when my parents divorced, we didn’t have any money for a while. My birthday presents were my school uniform and pencil cases. And I think that’s one of the reasons why my education means so much to me because my dad really couldn’t afford to send me to the school he sent me to. He just didn’t have the money. So I worked hard every single day I was at that school to make him proud of me and for him to know that I appreciated it. And I do. And I still do.” - Emma Watson in ‘When Harry Left Hogwarts’