A 1937 was 33 years old in 1970, like driving a 1988 car today. Old, but not antique. One of my coworkers in 1972 had a 1937 Chevrolet pickup that was still running fine.
As someone who loves cars and who pays a great deal of attention to every-day societal history, it just strikes me that very few over the decades regularly used cars older than 20. Try to find some in any given vintage photo.
In fact now, you won’t find a whole lot of ‘80s cars on the road.
Then there is Cuba, where they keep the last American cars they had when Fidel took over running as well as they can…