A Year Is Not a Year

The early years count twice: once on the money clock and once on the life clock.

Maya is 25. A dollar she puts away this year has 42 years to grow before 67, and at 7% a year after inflation it becomes about 17.1 dollars.^M Her friend Theo is 45. His dollar has 22 years, and it becomes about 4.4 dollars.^M Same dollar, same rate, very different trip.

There's a second clock, and it runs the same direction. For Maya, this one year is 4.0% of the life she's lived so far. For Theo, it's 2.2%.^M At the page's default age of 32, the two numbers are 10.7× and 3.1%; by 67 they're 1.0× and 1.5%.^M

Nothing here says what Maya or Theo ought to do with the year. It says the year itself isn't the same size at every age, and it's bigger early on both counts.

Figure 5.1. The Money Clock

This one is plain arithmetic. Money that earns a return earns a return on the return, so a dollar's growth depends on how many years it gets.¹ A dollar at 20 has 47 years and becomes 24.0×; a dollar at 60 has seven and becomes 1.6×.^M The 7% is our labeled assumption, not a forecast, and the shape holds at any positive rate: earlier dollars always get more years.

Brian Preston, who co-hosts The Money Guy Show, traces his own start to that arithmetic. In his firm's telling, his high school economics teacher told the class, "I am so jealous of you. If you invest just $100 per month starting today, you will be a millionaire."² That's the money clock in one sentence. Looking back in 2024, Preston said his journey "started off probably in a little unhealthy place of being a tightwad," and that "I've learned through this wisdom of age that you've got to build memories by every decade."³ That's his view of his own path.

Figure 5.2. The Life Clock

The idea is more than a century old. William James reported Paul Janet's rule that "a child of 10 feels a year as 1/10 of his whole life — a man of 50 as 1/50," and James himself said it "roughly expresses the phenomena" but "cannot possibly be an elementary psychic law."⁴ Later studies found that age effects on how time feels are real but small. Across 499 people aged 14 to 94, they were "small-to-moderate… at most 10% of the variance."⁵ Across 1,865 people aged 16 to 80, "age differences… were very small, except for… how fast the last 10 years had passed."⁶ One proposed model even uses the square root of age instead of age.⁷

The one exception in that last study is the feeling most people mean when they say the years speed up: older people did report that the last decade went by faster.⁶

So this bar isn't a measurement of how a year feels. It's a simple yardstick, a year as a share of life so far, and it's on the page because it moves the same way the money clock does.

Figure 5.3. Both Clocks, Side by Side

The two panels sit next to each other and never get added up. One is dollars and one is a share of a life, and there's no honest exchange rate between them. What they share is direction: both are biggest on the left.

Economists have their own way of saying a year now and a year later aren't equal. Since Paul Samuelson's 1937 paper, the standard tool has been discounting: valuing something later at less than the same thing now.⁸ How much less is another matter. The leading review found "spectacular variation in implicit discount rates across studies," and stressed separating pure time preference from all the other reasons people choose now over later.⁹ So the direction is well established; the rate isn't one number.

The Austrian economist Ludwig von Mises put the direction more bluntly: "Present goods are more valuable than future goods. Time preference is a categorial requisite of human action."¹⁰ That's his view of why it holds. Mainstream economics agrees on the direction and argues about the reasons and the size.^{8 9}

FIRE, the push for financial independence and an early retirement, prices future free time on the money clock. This page adds the life clock and leaves the question open: what are those early years holding?

Psychology adds one more piece. As people sense less time ahead of them, their goals tend to shift, and "time left becomes a better predictor than chronological age."^{11 12} The years don't just carry different dollar weights; people use them for different things.

What the early years hold

Time-use surveys add a third picture. In U.S. data pooled from 2010 to 2024, time spent with children peaks at about 4.3 hours a day around age 39, on average, and is under an hour a day from about 64 on. Time alone climbs from 4.8 hours a day at 32 to 7.4 at 67.¹³ These are averages across different people at different ages in the same years, not one generation followed through life. And time alone isn't loneliness: one large study found loneliness running high among young adults as well as the oldest old.¹⁴

Spending has a late-life curve too. The retirement researcher Michael Finke put his view this way: "we change physically, we change cognitively, and our ability to enjoy the money actually diminishes a little bit every year in retirement."¹⁵ That's his view, from an interview. The data show the pattern but not the reason. David Blanchett found that real retiree spending falls "approximately 1 percent per year" on average, and that older retirees "incur higher relative medical expenses."¹⁶ In the BLS survey, households aged 75 and older spent an average of $55,834 in 2024, compared with $65,354 at 65–74. Those are means for different households, not one household tracked over time.¹⁷

Now try your age

The tool below draws a life as a grid of years, up to 99. Tap a year or drag across them, and two numbers follow you: what a dollar saved that year grows to by 67, and how big that year is next to the life you've lived so far. After 67 the money clock stops counting, because this tool counts to 67. The money itself can keep growing. The life clock keeps going. The grid splits at your age into the years behind and the years ahead, with common milestone ages marked: first marriage (median 28.4 for women and 30.8 for men), first birth (mean 27.6, for mothers), the peak in time with children (around 39), and Social Security's full retirement age (67 for anyone born in 1960 or later).^{18 19 13 20} The years ahead come from the national life table and are an average for everyone that age: at 32, about 48 more.²¹ These are population figures, not a schedule, and they say nothing about any one life.

Say $10,000 goes in at 32 and is left alone. At 7% a year after inflation, it's $106,766 at 67, about 10.7 times what went in.^M The same $10,000 at 25 would be $171,443; at 45, $44,304.^M And the year at 32 is 3.1% of the life lived so far, about twice its share at 67.^M

What this is not

This isn't a case for spending the early years or for saving all of them. Both clocks run fastest early, and that's the whole point: the early years count twice, and the page shows both counts side by side without picking a winner. The 7% is an assumption, the life clock is an illustration, and neither is a forecast.

You may have seen bigger multipliers elsewhere. The Money Guy's Wealth Multiplier runs to 65 on its own schedule of rates, starting at 10% at age 20 and compounded monthly, so age 20 shows about 88×.²² Ours runs to 67 at 7% a year after inflation, so age 20 shows 24.0×.^M Same shape, different assumptions; theirs is theirs. Education, not advice.

A year off in your 40s instead of your 70s: Don't Save the Best.