Not the OP, but the first two reasons why TV & movies from 70 years ago age worse are:
1. Quality of special effects
2. Specifically for TV, it was often treated as the medium where you dump scripts that weren’t good enough to be made into a movie.
The vast, vast majority of content from 70 years ago doesn't have special effects at all.
And I'm sorry but that's not how scripts work. Episodic television and one-off movies have entirely different dramatic structures and aren't even remotely interchangeable. You can't just turn a movie into TV.
One of the greatest TV shows of all time, I Love Lucy, is from 70 years ago. And in terms of enjoyment, it hasn't aged at all. Nor did it require special effects. ;)
Above all, the 1950's was called the "Golden Age of Television" for a reason! [1]
1. Quality of special effects 2. Specifically for TV, it was often treated as the medium where you dump scripts that weren’t good enough to be made into a movie.