That is true. 
I think I will start getting some carbon fiber panels made. 
It is lighter, and wont rust. 
Or I could have aluminium panels made....the car has saved me a bucket load of money by now. lol

Satosora

There are some chemicals you can use to slow down rusting, in the parts of the car that aren't painted. And from time to time you just change some body parts (ok, not you literally likely, unless you are welder by the profession).

kristapsk

alter_native

Old or New cars? 

That is true, but you cant prevent rust on an old Japanese car. 
They just werent painted as well as other cars of that era. 