It would need to rust a lot before it lost enough steel to be a problem.
joking, but in the United States there were hardly any road bikes to speak of prior to the 1972 bike boom and you don’t see a lot of kids bikes older than the muscle bike fad either. If you want an older bike, this is the kind of bike it is. And it will definitely look great next to a rat rod as is, or fixed up and painted next to a classic car. The intact tank I’m sure is a big bonus.