Well, if episodes 7-9 are made then (If I remember what GL has said in the past) the only characters that show up in all 9 episodes are the Droids, so then we won't have to worry about Han, Luke and Leia being too old. I don't recall when the next three were supposed to take place (how many years after Jedi) but since the Droids are the only characters in all nine, I'd assume that it's at least ten years or so. Which would make perfect sense. By that time the Empire could have been totally defeated and the Republic has been restored. Of course, this is all specualtion. Also GL has stated that 7-9 are even more political that 1-3 and therefore probably wouldn't be very interesting to the general audience.