I don't think it has evolved much at all. New words, yes, and some words fell out of favor. But you can find a book written in the 50s or a movie from the 50s a

I don't think it has evolved much at all. New words, yes, and some words fell out of favor. But you can find a book written in the 50s or a movie from the 50s and you would have no trouble understanding it. I'm fact, without context, you likely wouldn't notice it was from 70 years ago.