That said, I know for myself that my attention span has gotten shorter. I used to read more. Now I listen to audiobooks. When reading text, even engaging fiction can be a struggle. I read one or two pages and feel the urge to check something else or look at something else or get up and do something. I know this wasn't the case in middle school or high school (late 2000s).
I think it's because of first podcasts and then watching / listening to too thousands of YouTube videos at 2x speed. I've become much more "efficient" at consuming entertainment content - so "efficient" that I can get bored listening to someone telling an interesting story at 1x speed.
The only advantage I have is that I can tell that this has happened and I can work against it by forcing myself to read more. But if things were always like that, how would I know? When you're sleep deprived every day for years, you don't notice how much it is affecting you. It's the same with a short attention span.
[1]: Aside: the omnipresent talk about generations these days is maybe not the best thing to begin with.