A lot depends on what area they are from and how well they are taken care of. My car is a north east car. It originally came from Maryland,but has been in PA and NJ. It has minor surface rust that I've been addressing on the underside. Luckily, no real rust for a car that has seen road salt. Now that I have it, it will never see salted roads again.
Cars from Arizona, Texas etc.. don't usually rust but do have problems caused by high temperatures. Brittle plastic, windows unglued etc...
All in all, these are pretty solid cars and i haven't seen any real rusted out ones.