I like to learn from long-form content that can go into detail on a topic. That's much more appealing. Then again, I'm on Hacker News, and I think the majority of the people here are the kind of people that prefer long-form content over short-form, otherwise we'd be scrolling through TikTok rather than reading articles and typing multi-paragraph comments.
What I was originally trying to say though is: I don't know that it's old age. I'm young and I don't find it enjoyable.
I haven’t used TikTok but I do use Instagram reels and the feed is what you make of it. I follow a lot of musicians so I get interesting snippets of songs or things people are working on, or theory/exercise tips etc.
But to someone who doesn't like those parts of social interactions the whole thing is just boring or even revolting.