Why Does Time Feel Faster as We Age?
1. Quick Summary
Two different judgements get mixed together here. How long something feels while it is happening, and how long a period feels when you look back on it, are produced by different processes and can disagree. A holiday can feel long in prospect, pass quickly, and then seem long in memory.
The retrospective judgement, the one that makes years seem to accelerate, appears to depend largely on how much new information was encoded. Periods rich in novel events leave a dense record and feel long in retrospect; routine periods leave little and feel short.
2. What It Means
Prospective timing, judging duration as it passes, is thought to rely on something like an internal accumulator: attentional resources are devoted to monitoring time itself, and the more attention goes to the passage of time, the longer it feels. Distract someone and the interval feels shorter.
Retrospective timing works differently. When you estimate how long something took afterwards, you appear to infer it from how much you remember, so an interval containing many distinct events is judged longer than an empty one of equal length.
That explains the holiday paradox: a week of travel feels long in memory because it is full of new places and events, even though the days may have passed quickly, whereas a routine week at work produces few new memories and seems to vanish.
3. Why It Happens
Novelty declines with age for structural reasons. Children are encountering an enormous proportion of things for the first time, and each first experience is encoded richly. Adults increasingly operate on routine, and routine is by definition what the brain does not bother to encode in detail.
Proportionality is the other classic explanation: a year is a tenth of a ten-year-old’s life and a fortieth of a forty-year-old’s. It is intuitively appealing and it probably contributes, but it predicts a smooth decline that does not match how unevenly the effect is actually reported.
Attention and dopamine are also implicated. Models of interval timing suggest that dopamine-related signalling influences the perceived rate of an internal clock, so states that alter that signalling change how long intervals feel, which is part of why time distorts under stress or intense focus.
Emotional state changes both judgements. Fear and high arousal make events feel slow while they happen and often produce vivid, detailed memories, which is why dangerous moments are remembered as lasting longer than they did.
4. Real Examples
The classic demonstration is the filled-interval effect: two intervals of identical length are presented, one empty and one filled with varied stimuli, and people reliably judge the filled one as longer when asked afterwards.
Lockdowns provided an unintended large-scale example, with many people reporting that weeks both dragged while they were happening and then seemed to have disappeared when looked back on, which is exactly the dissociation the two mechanisms predict.
Young children’s sense of time is measurably different in the other direction. A summer can feel enormous to a child in a way that it does not to the adult watching them, and the difference is usually attributed to how much of it is new.
5. How It Affects Us
The practical implication is unsurprising but genuine: novel experiences, learning new things and changing routines all appear to slow the retrospective sense that years are disappearing, because they add encoded events.
It also explains why looking back over a decade can feel like very little happened even when it was busy. Busyness with routine work produces fewer distinct memories than a much less busy period full of new experiences.
And it is a reminder that the feeling is a measurement artefact rather than a fact about time. Nothing about the passage of time has changed; what changed is the density of what was recorded.
6. Key Takeaways
- Prospective timing and retrospective timing are different processes, and they can disagree about the same interval.
- Retrospective duration is inferred from how much was encoded, so novel periods feel longer in memory.
- Routine is what the brain does not record in detail, which is why adult years compress in retrospect.
- The proportional-life explanation contributes but predicts a smoother decline than people actually report.