Summer vacation once felt endless. Now entire years seem capable of disappearing between two Christmases.
It’s one of the strangest parts of getting older: clocks continue moving at exactly the same speed, but life can feel as though someone has pressed fast-forward.
Scientists don’t have one definitive explanation for why this happens. But research into memory, attention and time perception offers some intriguing clues—and suggests that the way we live may influence how long our lives feel in retrospect.
Your brain doesn’t experience time like a clock
A clock measures seconds uniformly. Your brain doesn’t.
Five minutes waiting for important news can feel painfully long. Five minutes laughing with friends can vanish almost instantly.
Our perception of time is constructed by the brain and is strongly influenced by attention, memory and what we’re experiencing.
Research on time perception, attention and memory has shown just how intertwined these processes are.
This also helps explain an apparent contradiction: an enjoyable experience can feel fast while it’s happening but seem rich and substantial when remembered later. A boring period can drag in the moment yet leave almost nothing memorable behind.
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Routine may make months disappear in hindsight
Think about childhood.
A first airplane trip, first day at a new school, first sleepover or first visit to the ocean generates a flood of unfamiliar information. Children are constantly encountering things they’ve never experienced before.
Adults frequently do the opposite.
We wake at the same time, drive familiar roads, work familiar schedules, shop at the same stores and perform routines we’ve repeated hundreds of times.
Novel experiences tend to create distinctive memories, while repetitive periods can become compressed when we look back on them.
This doesn’t necessarily mean novelty literally slows your internal clock. Rather, a period filled with memorable events may appear longer and richer in retrospect because the brain has more landmarks from which to reconstruct it.
Three months containing a new trip, class, friendship and hobby may leave far more memory behind than three months spent repeating nearly identical weeks.
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Attention changes time, too
Anyone who has watched a microwave countdown knows attention can distort time.
Focus intensely on time passing and a minute can feel remarkably long. Become absorbed in something interesting and an hour can disappear.
Scientists distinguish between different kinds of time judgments, including how long something feels while we’re experiencing it and how long we think it lasted afterward.
There isn’t one single “time perception” system that explains every experience of time.
Researchers continue to debate how much age-related differences reflect changes in timing mechanisms themselves versus changes in cognitive processes used to judge time.
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So the popular claim that “science has proven exactly why time speeds up after 50” goes considerably beyond the evidence.
The proportional theory is appealing—but incomplete
You’ve probably heard another explanation.
For a 5-year-old, one year represents 20% of the life they’ve experienced. For a 50-year-old, it represents only 2%.
It’s an intuitively satisfying idea: each new year represents a progressively smaller fraction of our accumulated life.
But the mathematical fact that a year becomes a smaller proportion of your life doesn’t establish that this is the biological mechanism making time feel faster.
Time perception is influenced by too many cognitive and contextual factors for one neat equation to explain it all.
Still, the proportional idea captures something emotionally recognizable. A year simply occupies a different place in the life of a child than it does in someone who has already accumulated decades of them.
Can you make life feel slower?
You can’t slow chronological time, but you may be able to make stretches of life more distinctive.
Novelty doesn’t require flying to Thailand or taking up skydiving.
Visit a town you’ve never explored. Learn an instrument. Take a different walking route. Cook something unfamiliar. Start a class. Invite someone new to dinner. Rearrange your normal weekend.
Creating more distinctive experiences gives memory more landmarks with which to organize a period of your life.
Attention may matter as well. Constantly moving between your phone, television, work and other distractions can leave experiences poorly encoded in memory.
Being genuinely present won’t make a 24-hour day contain 30 hours. But it may make more of those 24 hours memorable.
Final word
Perhaps the unnerving feeling that life accelerates with age isn’t entirely about time.
It may partly be about memory.
A life composed of repeated routines can become efficient and comfortable, but efficiency has a strange downside: fewer moments stand apart when we look backward.
The science isn’t settled enough to prescribe a formula for making a year feel longer. But research on attention and memory provides a useful clue.
If you want life to feel fuller, don’t just add more activity. Add more moments your brain has a reason to remember.
We can’t stop the calendar. We can, however, give our memories more punctuation marks along the way.
