Within the Star Wars timeline, we first see Chewbacca in Episode III: The Revenge of the Sith. In it he appears as a full grown adult and seems to have a high status within his community. Then, of course, he appears in the "middle 3" episodes, where he pretty much looks the same. Now he has appeared in Episode VII: The Force Awakens, still looking as if he hasn't aged. That is a period of over 50 years. How long do Wookiees live, and how do they change as they age?
Canon answers preferred, if possible.