Why does time feel faster as we age?
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tl;dr
Two effects stack: each year is a smaller fraction of your life, and adult routine writes fewer memories than childhood's parade of first times. Less recorded, less replayed — the year feels short. Novelty is the brake.
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Time feels faster as we age because the measuring stick shrinks and the diary thins. Each new year is a smaller fraction of the life you've already lived, and adult routine writes far fewer new memories — so when you look back, there's less to replay, and the year reads short.
The shrinking slice
To an eight-year-old, one year is an eighth of everything they have ever known. To a fifty-year-old, the same year is one-fiftieth. The clock hasn't changed; the denominator has. Every birthday quietly dilutes the next year's share of your life.
The thinning diary
Your sense of a period's length, looking back, tracks how much memorable material it contains. Childhood is packed with first times — first school, first trip, first everything — and firsts get filed in detail. Adult weeks repeat, and repetition barely gets written down. A year with three novelties replays in seconds.
Slowing it back down
You can't grow the denominator, but you can fatten the diary: new places, new skills, new people. Novelty writes memory, and memory is what a long year is made of.
cited
Sources
- [01]Time perception — Wikipedia
“The apparent speeding of time with age is commonly linked to the proportional theory — each interval is a smaller fraction of life lived — and to reduced memorable novelty in adult routine.”
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Why did school summers feel endless?
They were dense with novelty and they were a huge slice of a short life. A ten-week summer at age nine is both packed with first times and a meaningful fraction of your whole existence — the two effects that shrink adult years both ran in reverse.
Does time in the moment also speed up?
Less than looking back. In-the-moment time tracks attention: boredom stretches minutes, absorption swallows hours. The 'fast years' feeling is mostly retrospective — it comes from how little the replay contains.
Can new habits really slow time down?
Retrospectively, yes. People who fill a period with new experiences consistently judge it longer afterward. A week of travel routinely feels longer in memory than a month of routine — the diary got thicker.
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