http://www.buzzfeed.com/jemimaskelley/bring-on-the-haters#.mtZP7K6Bnm (http://www.buzzfeed.com/jemimaskelley/bring-on-the-haters#.mtZP7K6Bnm)
One thing that's always troubled me about Snape is that if you do the math, the man was barely in his early thirties, but in the books' illustrations (where he had a beard) and on screen, Snape looked much more mature.