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Situational, I suppose. I still have an active project that's not quite 30 years old (it's mid-20's) that I reference old notes for all the time.

Actually... I reference a lot of notes from at least 20 years ago. There is a lot that doesn't change, you forget, and is an instantaneous search away. I don't foresee this changing in the interim 10 years.

If you are making notes about your life, memories, etc, you might want to revisit them years in the future, and not tomorrow

Depends on which notes you take. I still have academic notes from 15 years ago that are useful.

I'm an academic. Any kind of note that I didn't migrate to a durable support from more than a year ago is basically gone.

I constantly have book X that I read ages ago where I need to find point Y. My notes are valuable for that. But I and my note-taking are not universal.

But even if I it wasn't I don't like to think about the lifetime of any thought as I note it down. This os a distraction I don't need. If the closet with the notes in it fails, I want to be able to read them still.