I was watching The Force Awakens and there is a line uttered by Han Solo in the film in regards to Rey's comment regarding the Jedi. She has been on Jakku for a long time and she is very young, so it makes sense that she is out of the loop when it comes to the time line thirty years before. But Han says, when Rey says, "The Jedi were real!",
Han: "I used to wonder about that myself. Thought it was a bunch of mumbo jumbo..."
And we know that he was not really a believer in the Force. But how could he not know that the Jedi were real. He was 10 at the time of Revenge of the Sith and he must have grown up with the Old Republic so he must have heard stories of the Jedi "Betrayal" of the Republic once the Empire took over and must have heard about the Jedi being wiped out. Also, as Chewbacca knew Yoda, how would he not believe that they were real? This seems far fetched...