Everyone over 40 says it. "The years go faster now." They said it when they were 30, too. Psychologists have explanations: proportional theory (a year is a smaller fraction of your life the older you get), fewer novel experiences, routine compressing memory. It feels real, but it isn't. The clock on the wall doesn't care how old you are. A minute is a minute.
But what if it wasn't?
What if time actually, physically, measurably moved faster for older people? Not perception. Not psychology. Actual physics. The clock on a 70-year-old's wall ticks twice as fast as the clock on a child's wall, and both are keeping perfect time in their own reference frame.
The mechanism
We need rules or this thought experiment collapses into nonsense. So here's the framework: from birth, your personal time rate is 1.0x. It increases linearly with age. By 40, you're running at 1.5x. By 60, you're at 2.0x. By 80, you're at 2.5x. A child's hour is still 60 minutes. An 80-year-old's hour, measured by an external observer, is about 24 minutes.
This isn't relative to perception. It's relative to everything outside you. You still experience your time at normal speed. Your thoughts, your movements, your heartbeat all feel normal to you. But to a child watching you, you're moving at 2.5 times normal speed. You're a slightly blurred figure, speaking in a chipmunk pitch, ageing visibly across months.
To you, the child is moving in slow motion. Agonisingly, beautifully slow. Their laughter stretches out. Their footsteps take forever to land.
What a life looks like
Childhood would be glorious. Not because anything about childhood changes, but because you'd have so much of it. Ten years at 1.0x to 1.1x speed is genuinely ten years. Long, stretching summers. Endless school terms that actually feel endless. Everything the nostalgic adult remembers about childhood being slow and golden would be literally true.
Your twenties would feel almost as long. Speed 1.2x to 1.4x. University, first jobs, travel, relationships: all experienced with near-normal duration. The compression starts creeping in during your thirties. By 35, at roughly 1.4x, a calendar year passes in about eight and a half months of subjective time. Noticeable. Not yet alarming.
Then your forties hit and the acceleration becomes impossible to ignore. At 1.5x, a year is eight months. At 1.6x, seven and a half. Your children, still running at close to 1.0x, are growing up at a rate you can almost see. You drop them at school on Monday and it feels like Wednesday when you pick them up. Their childhood, which should be long and slow, whips past you while they're living every minute of it.
By retirement age, the maths is brutal. At 65, running at 1.9x, a year is about six and a half months of subjective time. You retire. You have plans. Travel, gardening, finally reading Proust. Then five years pass in what feels like two and a half, and suddenly you're 70 and the acceleration is still increasing.
A retirement that spans 15 calendar years, from 65 to 80, would subjectively feel like about six. Six years. That's it. That's your reward for four decades of work.
Work and wages
This creates an economic problem that no existing framework can handle. A 25-year-old and a 55-year-old are sitting in the same office. They both work from 9 to 5. But the 55-year-old's eight hours pass in about five hours of external time. From the company's perspective, the older worker is delivering less real-world output per calendar day, because their day is genuinely shorter in external terms.
Or is it the opposite? The older worker's brain runs faster. They think, type, and act at 1.8x speed relative to the outside world. To the 25-year-old colleague, the 55-year-old is a blur of productivity, firing off emails and completing tasks at nearly double speed. But they also run out of day sooner. Their lunch break is 15 minutes in real time.
Hourly pay becomes meaningless. Whose hours? The worker's subjective hours or the clock's external hours? A 55-year-old working an external 8-hour day has experienced about 14.5 hours of subjective time. Are they being paid for 8 hours or 14.5? Neither answer feels fair.
Relationships across the gap
A couple ages together, but not at the same rate unless they were born on the same day. A husband five years older than his wife would experience time progressively faster than her. At 60 and 55, the gap is modest. At 75 and 70, he's running at 2.3x while she's at 2.0x. Their shared evenings have different durations. He finishes his book in what feels like an hour to him and forty minutes to her. Conversations would need adjustment: he speaks faster from her perspective, she speaks slower from his.
The emotional weight is worse than the practical inconvenience. You're watching your partner accelerate away from you, or falling behind them. The person you've spent decades with is literally experiencing reality at a different speed. You sit together in the same room, on the same sofa, and you're not quite in the same time.
Parent-child relationships would carry a specific grief. Your mother at 75 is living at 2.3x. You visit her for what you experience as an afternoon. For her, you were there for about two hours. Your visits feel shorter and shorter to her, even though you're staying the same amount of external time. "You never visit" takes on a mathematically verifiable dimension.
Medicine and mortality
An 80-year-old's body runs at 2.5x speed. Their cells divide 2.5 times faster. Their metabolism runs 2.5 times faster. Does this mean they age biologically faster too? If so, the acceleration is doubly cruel: not only does your remaining time feel shorter, your body is burning through it at an accelerated rate. Cancer grows faster. Wounds heal faster but scars form faster. Medications metabolise in hours instead of the expected timeframe.
Dosing would be a nightmare. Drug half-lives would differ by patient age. An anaesthetic calibrated for an external clock would wear off too quickly in an elderly patient's subjective time, or last dangerously long from an external monitoring perspective. Surgeons operating on older patients would watch the body heal at visible speed under their hands. Younger surgeons, running slower, would struggle to keep pace with the physiological changes in an older patient's body.
Life expectancy in calendar years might not change. But subjective life expectancy would plummet. Living to 80 in this world doesn't give you 80 years of experience. If you integrate the accelerating rate from birth to 80, you get roughly 50 years of subjective time. Thirty years just vanish into the compression.
What we'd actually lose
The cruelest part isn't the speed. It's the asymmetry. Children would watch their grandparents flickering through the last years like a film on fast-forward. Grandparents would see their grandchildren growing up in what felt like months. The two generations most drawn to each other would be the most separated by time.
And there'd be no fix. No drug, no technology, no lifestyle change. Just the grinding fact that the more life you've lived, the less of it you have left in every sense. The perception that time accelerates with age is already one of the most common and most melancholy observations about being human. Making it real wouldn't teach us anything new. It would just remove the comfort of knowing it's only in our heads.