Why Does Time Seem to Go Faster as You Get Older? The Science of the Shrinking Year

When you were eight, the six weeks of summer holiday felt like a lifetime. Christmas took forever to arrive. A year was an enormous, almost unimaginable stretch of time.

Now, for many of us, the years seem to slip past. It feels like last week that you were making New Year's resolutions, and suddenly the shops are full of autumn decorations again. "Where did the year go?" is one of the most common things adults say to each other.

Is time really speeding up as we age, or does it just feel that way? And if it is a feeling, where does it come from?

The quick answer

Clock time does not change, of course. But our sense of how fast the years pass does seem to change with age. The leading explanations are that childhood and youth are packed with new experiences, which create many distinct memories and make those periods feel long in hindsight, while adult routines create fewer new memories, so the years feel shorter when we look back. Other theories point to proportion, each year being a smaller fraction of our life, and to changes in how the brain processes information.

Is the feeling real? What surveys show

In 2005, psychologists Marc Wittmann and Sandra Lehnhoff published a study of 499 people in Germany and Austria aged between 14 and 94. They asked participants how fast time seemed to pass over different periods, from a week to a decade.

For short periods, a week, a month, even a year, there was no clear age difference. People of all ages tended to feel that time was passing quickly. The difference appeared when people looked back over longer stretches. Older participants were more likely to feel that the past ten years had flown by. And when people over 40 reflected on their lives, they typically described time as passing slowly in childhood and speeding up through their teens and into adulthood.

So the feeling is real, but it is mostly a feeling about the past, not about the present moment.

Explanation 1: Each year is a smaller slice of your life

The oldest explanation is mathematical. In 1877, the French philosopher Paul Janet suggested that we judge the length of a period of time in proportion to the time we have already lived.

For a five-year-old, one year is a fifth of their entire life. For a fifty-year-old, it is a fiftieth. If our minds compare each year to everything we have experienced so far, a year will naturally feel smaller and smaller as we age.

The proportional theory is elegant and easy to remember, and it captures something people intuitively feel. But it does not explain why some periods of adult life, such as a year spent in a new country, can feel long and full, while others vanish. It also does not explain the mechanism: why would the brain do this calculation at all?

Explanation 2: Memory and novelty

Most psychologists today put memory at the centre of the story.

When something is new, the brain pays attention and records it in detail. The first day at school, the first holiday by the sea, the first kiss, the first job, the first flat. Childhood, adolescence and young adulthood are full of these firsts. Later in life, many days follow familiar routines: the same commute, the same office, the same supermarket. The brain does not need to record each of those days separately, so it does not.

When we look back and estimate how long a period lasted, we seem to rely partly on how many distinct memories it contains. A year full of new experiences leaves many memories and feels long in hindsight. A year of routine leaves fewer and seems to have passed in a flash.

Researchers have also identified what they call the reminiscence bump. When older adults are asked to recall memories from across their lives, a disproportionate number come from roughly the ages of 10 to 30, a period full of new experiences and important life events. Those years seem to occupy more space in our autobiographical memory, and the decades that follow feel thinner by comparison.

The holiday paradox

The writer and broadcaster Claudia Hammond, in her book Time Warped, described a related puzzle she called the holiday paradox. While you are on a good holiday, time seems to fly. The days are full of new places, food and activities, and they rush past. But when you get home and look back, the holiday feels long, sometimes as if you had been away for much more than a week.

The reason is that we judge time in two ways. Prospectively, while it is happening, time flies when we are busy and absorbed, and drags when we are bored and waiting. Retrospectively, when we look back, the busy, novel period feels long because it created so many memories, and the boring period shrinks because almost nothing in it was worth remembering.

Adult life often gives us the worst of both. Routine days can drag in the moment, especially at work, and then disappear in memory, leaving the impression that the years are racing.

Explanation 3: A physics and biology view

In 2019, Adrian Bejan, a professor of mechanical engineering at Duke University, offered a different, more physical explanation in the journal European Review. He argued that our sense of time is linked to the rate at which the brain perceives and processes new mental images.

According to Bejan, the speed at which we process those images slows with age, as the networks of nerves grow larger and more complex and as signal pathways degrade. He pointed to the fact that infants' eyes move more often than adults', which he interpreted as a sign of faster image processing. If a young brain takes in more images per day, each day contains more perceived change and feels longer. "Days seemed to last longer in your youth," he wrote, not because they were more meaningful but because the mind was registering more.

It is an intriguing idea, but it is one researcher's hypothesis, and it has not displaced the memory-based explanations favoured by most psychologists. The different theories may well work together.

Explanation 4: Life gets busier

Another factor is simply time pressure. Many adults feel they have more to do than time to do it: work, family, household tasks, caring responsibilities. When days are full of obligations, people often feel that time is short and moving fast. Children, whose days are largely structured by others, rarely feel this kind of pressure.

Can you make time feel longer?

If the memory explanation is right, the answer is yes, at least when you look back. The key is to give your brain more new things to record.

• Seek novelty. Travel, even locally. Visit a part of your city you have never explored. Try food you have never cooked.
• Learn something new. A language, an instrument, a sport, a craft. Learning forces the brain to pay attention.
• Break routines on purpose. Take a different route to work, rearrange a room, change your weekend habits.
• Meet new people. Social experiences are among the most memorable.
• Mark the time. Keep a journal, take photos or write down one notable thing each week. Reviewing them later shows how much actually happened.
• Be present. Paying close attention to an experience, rather than rushing through it on autopilot, helps the brain encode it in more detail.

None of this will slow the clock. But it can change how a year feels when you look back on it: full and long, instead of a blur.

The bottom line

The sense that time accelerates as we age is real, and almost universal. Yet it is less about the clock than about memory. Childhood years are crowded with firsts; adult years can become a loop of familiar days that leave few traces. Each year is also a smaller fraction of a growing life, and the brain itself may process the world a little more slowly.

The hopeful lesson is that novelty stretches time in memory. A year in which you try new things, go new places and meet new people will feel longer than a year in which nothing changes. If the years are flying by, the remedy may be to make them harder to forget.