I heard on a science podcast that your brain judges how much time has passed by how many new memories it makes. So a year stuffed with new memories (e.g. a kid’s) feels like forever, but a year with no new memories (e.g. an old person’s) isn’t registered as any time at all, because nothing happened.
They also refuted the popular theory that a year feels longer to a child and shorter to an adult as they vary in proportion to their total life.
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