really only have to be over 25 to feel this effect. but it gets stronger the older you get.
that said, i do think it's funny how often we look to the kids to decide what's 'cool' or 'popular'. the closer i get to 40 the less i benchmark what's cool against younger people. but i also choose not to judge younger people and their slang because, if we are willing to actually be self-reflective, we all sounded like idiots as kids with our slang. just becaues we have nostalgia about it doesn't mean 'hella' isn't stupid af.