Why Spending in Your 20s Can Beat Saving, and Where the Math Breaks Even

Personal finance usually treats a dollar as a dollar, inflation aside. A new take from the Of Dollars and Data blog challenges that assumption: the enjoyment you get from spending depends heavily on how old you are when you do it.

The argument starts with Paul Janet, a French philosopher who proposed in 1877 that perceived time speeds up with age because each year is a smaller share of your total life. At 10, a year is 10% of everything you have lived. At 50, it is 2%. The blogger adjusts the idea for the fact that most people remember little before about age 10, and research points to a "reminiscence bump" in memories from roughly ages 10 to 30. Counting memorable life from age 10, a year at 20 represents about 10% of it, while a year at 60 represents about 2%.

The upshot is that a year in your 20s takes up roughly five times as much of your perceived life as a year in your 60s. If experiences are valuable partly because we relive them in memory, the same spending should carry about five times the experiential payoff when you are young. The author backs this with personal experience: novelty fades, and the 60th fancy steak does not taste like the first.

That does not mean blowing everything early. Money invested also grows. At a 4% inflation-adjusted annual return, a dollar becomes about five dollars in real terms over 40 years. That nearly matches the five-times perception premium, so $100 spent at 25 is roughly equivalent, experience-wise, to $500 in today's purchasing power spent at 65.

The break-even point is the useful part for investors. Expect more than 4% real, and investing wins, because the future money will buy more enjoyment than the present spending. Expect less, or distrust investing altogether, and spending early makes more sense. Your view of expected returns quietly shapes how you should treat spending today.

The piece also flags two ironies. Your 20s are when money buys the most experience, yet that is when you have the least of it. And on the other side, the data suggests that diligent savers often fail to spend their wealth in retirement, which the author calls worse than overspending while young.

Health adds a further argument for front-loading some spending. Trips, marathons and playing with grandchildren all depend on physical ability that tends to decline. The author's conclusion is not to stop investing or to aim to die with nothing, but to spend on meaningful experiences without guilt while you are still young enough to enjoy them fully.

This is an opinion-driven framework rather than a precise model, and the author acknowledges that perceived time is not the same as experiential value. Still, it offers a handy way to frame the save-versus-spend tradeoff around a single number: the real return you believe you can earn.