Time is entropy unfolding as things with nonzero temperature do what they do.
Psychological time is your own weights being updated in response to stimuli and internal processing.
When there isn't anything interesting happening, no updates are needed, and you don't perceive much time. That's why there's a logarithmic effect on the "density" of time as you age.
This is actually something I was always confused about. If nothing interesting happens as we get old, it should be boring and as result, slow slog. Yet it feels like time accelerates as I get older.
sibling discussions are taking this as human perception. But it’s easier to think of it literally. Time is change. Physical state change. By “nothing interesting” - interpret it literally . if “nothing happens” then there is no time because there is no change, there’s no reference to distinguish each frame of time.