Episode VII was filmed 30 years after the end of Episode VI: Return of the Jedi. Since Episode VI was released in 1983, an age factor take place for actors such as Han Solo, Princess Leia, and Luke Skywalker.
Only four characters have appeared in all six previous movies and R2-D2 is one of them. This little droid will be on the screen again, and it’s not sure what his role will be. Kenny Baker, the human actor boxed up in R2 for all six Star Wars films, will be back as pilot. C3PO is also coming back.
Harrison Ford, who plays role of Han Solo, was injured in June when a hydraulic door on the Millennium Falcon crashed on his ankle. The filming group had to postpone movie making for the period of two weeks.