But I think what we forget is that there is a fine line between the general aging of a language/communication. - the difference between the Declaration of Independence and a contract today - and the sudden fads that pop up. How many of us now hear people from the '60s talk in hippie slang and laugh? I'm "today years old" or "that's how I adult!" are the "hey man, that is groovy, man" of yesterday.
I haven't had to say it in a while, but for a period there, from about 2016 to about 2018 I was really bummed, like REALLY bummed, that we were going to have a Presidential Library, whose main content was 140-characters or less tweets. Compare and contrast the hundreds of letters from John Adams to both his lovely wife and to his main political counterpoint, Thomas Jefferson with that of "Cofeve".