I know that happened with the fifties cars for sure.
To an extent , I can see that happen with some sixties cars, but not to the same degree.
For the most part, fifties cars were souped up by the owners of them ( nothing wrong with that ). The sixties brought in a whole new styling and you could order a new “ souped up “
Muscle car straight from the factory.
Even though many of us older folks on here grew up with the sixties cars, I see plenty of interest by folks ten-twenty years younger .
I feel that the muscle car era was a phenomenon that won’t fade with time like many fifties cars did.
This is just how I see it…..might be a little biased though