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Time Marches On

You're older than you've ever been, and now you're even older,
and now you're even older, and now you're even older.
You're older than you've ever been, and now you're even older,
and now you're older still.
Time is marching on, and time... is still marching on.

Any story must be written over some period of time. It can only be read at a later period (occasionally overlapping, but still later). Usually, this is fine. Some stories remain classics thousands of years after they were written. Others, not so much. The world shifts around them and they become less plausible, less interesting, less relevant, less funny, or even less comprehensible.

Contrast It Will Never Catch On, which is part in-universe example, part Historical In-Joke - though examples of those may, ironically, fit one of these tropes later on down the road.

Tropes that usually fall into this category: