When reading a book, you're allowed an incredible, almost worrying, amount of power. You can imagine the location however you like, the story can progress at whatever speed you wish (a five day break halfway through - go for it) and, most importantly, you can cast whomever you want in the roles.
But when someone else, read Hollywood, snatches this power away, book fans often revolt. Well you know, on Twitter and stuff. We've decided to spend our time looking at the differences in literary characters and big screen actors when it comes to their all important ages. The age of an actor compared to the character in print can change the dynamic and we've found an interesting variety.
Click to start the gallery below
(Images: Caroline Warner)