You are old enough to have a decent car, $13k is little much for a used car, UNLESS its something you really like.
Make sure to look up the value of the car on both Kelly Blue Book and NADA, dont rely on just one.
If you like it so much, go for it, but remember that they are having a rough time and you can probably get a much better deal if you want. You can almost buy a brand new truck for $13k, let alone a used Saab.