Why time seems to speed up as we get older

As a child, a summer holiday could seem almost inexhaustible. Later, you look up from an ordinary week and discover that another summer has gone. It is tempting to imagine that your brain has a clock whose hands spin faster with every birthday. The evidence points to something more interesting: we have several ways of judging time, and they do not always agree.

Researchers distinguish between the passage of time you feel now and the speed you assign to a period when you look back on it. There is also a difference between asking whether an interval lasted a long time and whether it seemed to pass quickly. Those questions sound similar, but they need not produce the same answer.

In a survey of 1,865 adults aged 16 to 80, people of all ages tended to say time passed quickly. Age differences were small for most questions. The notable exception was how fast the previous ten years seemed to have passed.¹ A later study of 868 people found much the same pattern: age made little difference to judgements about the past week, month or year, but did for the past decade.²

So the familiar feeling is real enough to merit explanation, but the sweeping claim that every hour accelerates as we age overstates what has been measured.

An afternoon is not a decade

One way to avoid mixing up the two experiences is to ask people about time while they are living it. In one study, younger and older adults answered smartphone prompts eight times a day for five days. Their reports of how quickly the present seemed to pass did not differ by age. Across both groups, mood and how absorbing an activity was mattered more.³

Think of waiting for a delayed train, then becoming absorbed in a conversation once it arrives. The wait may drag; the conversation may disappear in a flash. Neither experience requires your age to change. Attention matters: when it is captured by what you are doing, you are less occupied with time's passage.

Looking back involves a different job. You cannot replay a year minute by minute. You reconstruct it from whatever remains accessible: changes, events, feelings, routines and the story you tell about that period. This is where a life with many similar days can plausibly feel compressed. Yet the obvious version of that theory — more memorable events must mean a slower-seeming year — has proved surprisingly hard to confirm.

What memory can, and cannot, explain

In an experiment involving a radio story, listeners later estimated the gaps between pairs of scenes. Intervals with more changes in the story tended to be judged longer, and changes in brain activity while the story unfolded predicted later estimates.⁴ That is good evidence that remembered context can shape judgements about minutes. It does not establish that taking a weekend trip will make your entire decade feel longer.

For multi-year periods, the evidence is less tidy. Across three studies, researchers found that the number of life events people reported did not predict how quickly the previous five years seemed to have passed.⁵ A 2026 study of 120 adults likewise found no link between the speed attributed to the previous decade and the number or personal importance of memories people could recall. Instead, the faster-decade judgement was associated with poorer performance on a test of forming new memories. The authors suggest that encoding new information may matter more than a simple count of remembered events, while stressing that their sample cannot settle the question.⁶

This distinction matters. “Make more memories” is a pleasing slogan, but memory is not a stack of postcards that the mind silently counts before deciding how long a year was. The act of encoding experience, the changes within it, and the later judgment may all play different parts.

The pressure of a full calendar

There is another, less romantic ingredient: feeling short of time. The large survey of adults found support for a link between time pressure and the impression that time passes quickly.¹ In the later study, people reporting more pressure now tended to say recent intervals had sped by; those recalling more pressure ten years earlier tended to say the past decade had passed quickly. The researchers also found signs that people underestimate how pressured they felt in the past, which may colour comparisons between then and now.²

That helps explain a common contradiction. A working week packed with deadlines can feel as though it vanishes, even if little about it is novel. A quiet afternoon may stretch out while it happens, yet leave few distinct landmarks when recalled months later. “Time flies” can describe a moment of attention, a memory of a period, or a sense that life is crowded. It is worth asking which one you mean.

What about the neat arithmetic that says one year is a fifth of a five-year-old's life but only a fiftieth of a fifty-year-old's? Those fractions are true, of course. The leap from a fraction to a felt speed is the unproven part. It cannot by itself explain why the same adult can experience one hour as endless and another as fleeting, or why age differences cluster around judgements of longer periods rather than every unit of time.

Can you make a year feel longer?

There is no tested recipe for stretching the felt length of a life. Still, the research suggests a modest experiment. If weeks are blurring together, give some of them an identifiable shape: learn something, go somewhere unfamiliar, see someone in a different setting, or make a small record of what happened. Distinct experiences may create clearer landmarks when you later look back. That is a plausible application of research on remembered change, not a promise that novelty can defeat ageing.⁴,⁵

You can also ask whether you want time to slow while you are in it or feel fuller afterwards. A dull wait can seem long in the moment and empty in memory. A deeply engaging day may pass quickly and remain vivid. Neither is a failure of perception. The mind is answering two different questions, and neither answer comes from the clock on the wall.