Alan Rickman protrayed Snape even though he was older. Rowling aproved because
1) She always imagined Alan Rickman as the man who played Snape
2) Since Rickman looked older, it gave him a look of stress. Snape had a lot fo stress
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Thank you @GalaxyCat101 for telling me this one!

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Facts about Harry Potter that you didn't know
RandomIn this book you'll finds some facts about Harry Potter characters that you probably didn't know. Enjoy! Disclaimer: I own nothing