Salt damage / rust on used car?

I'm interested in buying a used 2006 Honda Civic Si. However the car is from a snow state and I have heard about the damage the salt they use in snow states can cause to a car. However I didn't see any rust on the undercarriage or anywhere except for the rotors. The car has been out of snow for at least one year and it was only in Oklahoma for 5 years. Is this even enough time to cause any worry? Does the rust on the rotors mean that there could be later issues? Everything else looks clean including the paint. I'm worried that this car may turn out to cost me more money than it should.
Anyone have experience with this sort of issue or recommendations.

The rust on the rotors means it has not been driven lately. They are a cast iron and rust pretty fast but should come back to shiny as soon as ypu drive it and use the brakes

Sure, salt can cause a lot of damage to a car. But if they took care of it and washed it regularly it's probably fine. My car is 15 years old and I'm in a salt state. No major rust problems. Yes, the screws holding the rotors on often rust. I just replaced my rotors and it took a little effort to unscrew them, but it's fine. Humidity will also cause rust issues. Just keep up on the maintenance and wash it when it needs it (undercarriage too!)

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