This is one of those things that sounds like it could be true… Until you think about it at all. Think about the words you used as a child compared to how your parents talked.
Go look at 70’s and 80’s slang and consider if people spoke that way because they were trying to be sneaky, or if they were just trying to sound “hip”.
Oh no! A statement which applies to the vast majority has some exceptions! Better break out the um-actually and technically-incorrect stamps.
As someone who has worked in IT, age has a strong negative correlation with tech literacy. Is every boomer tech illiterate? Of course not. Some boomers built the tech we use today. But most boomers are worse with tech than most ten year olds.