A person who is seventy might say that a summer in childhood lasted a lifetime, while the last ten years vanished. It is a common observation, and it feels like a fact. But what do the studies find?
The answer is more interesting than “time flies when you age”. It turns out that people of nearly every age say time passes quickly, that the age differences are small, and that no one has settled the reason.
What surveys actually found
William Friedman and Steve Janssen (2010) surveyed 1,865 adults aged 16 to 80 from two countries about how fast different spans of time seemed to pass. Their main result is not what the folk belief predicts: people of all ages reported that time seems to pass quickly, and differences by age were small. The one clear exception was the past ten years, which older adults tended to say went by faster.
Earlier work by Marc Wittmann and Sandra Lehnhoff (2005), with 499 people aged 14 to 94 from Germany and Austria, found a similar picture: only a weak connection between age and felt speed, with the sense of the last decade rushing by peaking around age 50 rather than rising steadily. Summaries of both studies suggest that age explained only about 1% of how fast time felt in general and about 4% for the last decade. The sense of being busy or rushed explained more, around 10%.
Three explanations, compared
Proportion
A year is 20% of a five-year-old’s life but 2% of a fifty-year-old’s, so it feels shorter. An old proposal from the 1870s. As far as the sources reviewed here show, it has not been strongly tested; it remains a hypothesis.
Memory and novelty
Childhood is full of firsts, so it leaves more distinct memories, and years with fewer new events feel shorter in hindsight. William James suggested something like this in 1890. Friedman and Janssen’s experiments found little support for it.
Time pressure
People who feel rushed say time passes quickly, whatever their age. This is the explanation Friedman and Janssen’s data favoured, and similar patterns were reported across several countries.
Why the memory idea keeps its appeal
Even if it is not well supported by these experiments, the memory account fits ordinary experience. A week abroad, a first job, a move to a new city: these feel long in retrospect, while a year of commutes can blur. The idea does not need to be wrong; it may simply be hard to test, and it may work differently for how time feels now versus how long ago something seems. Researchers separate these two kinds of judgment, and a theory that fits one may not fit the other.
- A stretch of life is full of new things. New places, people and skills.
- Many distinct memories form. Each can be recalled separately.
- Looking back, the period seems long. There is a lot to count.
- Routine years leave fewer markers. Looking back, they seem shorter, even if they were not busier.
Why it still feels unsettling
The feeling that life is slipping away is real even if its cause is uncertain. It may be less about the clock and more about two things the research does touch: constant busyness, and years that leave few vivid markers. Neither is an inevitable part of ageing. Both depend a lot on how a life is arranged, which is a gentler conclusion than the idea that the brain simply speeds up.
It also helps to remember that surveys describe averages. Plenty of older adults do not report this feeling, and plenty of young adults do. The pattern is a tendency, not a rule, and your own experience may differ.
