Is Midlife the Flattest Stretch of Life? What the Happiness U-Curve Shows, and Who Disputes It

A man of 47 has a job he’s decent at, a mortgage he can pay, and a Tuesday that is indistinguishable from the Tuesday before. Nothing is wrong, and that is what bothers him. Is there a name for this, and is it a real stage of life or a story that sells books? The short version: economists have found a dip in average life satisfaction in middle age in dozens of countries, centred in the late 40s in rich ones, and other researchers argue the dip is partly built by how the data are analysed. Both camps are publishing, and the dispute is not settled.

What did the original papers actually find?

Blanchflower and Oswald’s 2008 paper “Is well-being U-shaped over the life cycle?” (Social Science & Medicine) used survey data on about 500,000 randomly sampled Americans and West Europeans. They reported that well-being reached a minimum in middle age for both men and women on both sides of the Atlantic, and that the U-shape held in a country-by-country analysis of 72 countries. In their US General Social Survey estimates the minimum fell at 44.5 years.

Blanchflower returned to the question in “Is happiness U-shaped everywhere?” (Journal of Population Economics, 2021), now covering 145 countries and controlling for education, marital status and labour-force status. The published abstract puts the low point around age 50. His earlier working paper averaged the country estimates and got 47.2 for advanced economies and 48.2 for developing ones, which is where the popular “around 47” figure comes from.

Jonathan Rauch’s 2018 book The Happiness Curve took this to a general audience. Rauch describes the dip as a malaise in the forties rather than a crisis, followed by a recovery that starts around 50. He is a journalist reporting an academic literature plus his own experience, and the book is best read as a popularisation of the 2008 and later economics papers, not as new evidence.

Why do critics say the curve may be an artefact?

The main objection is about method. Kratz and Brüderl, in a 2021 paper on the age trajectory of happiness, argue that two common choices tilt results toward a U: including controls such as marital status, and restricting samples to people under 70. Marital status is partly a consequence of age, so holding it fixed removes part of age’s real effect. Using German panel data, which follows the same people over time, they find a nearly steady decline with age rather than a U.

Galambos, Krahn, Johnson and Lachman make a related point in Perspectives on Psychological Science (2020): cross-sectional surveys compare different people of different ages, and that cannot show how one person’s happiness moves across a life. They called the conclusion that happiness falls from late adolescence to midlife “premature, and possibly wrong.” Blanchflower and Graham replied in the same journal in 2021, defending the U-shape across many datasets.

So the fair reading is that the dip appears in many cross-sections, appears more weakly or not at all in some within-person data, and is sensitive to which controls are included. Nobody has run a controlled experiment on ageing, and nobody will.

Is the curve flattening now?

Possibly. Blanchflower, Bryson and Xu (NBER working paper 32337, 2024) report that the usual hump in unhappiness by age has disappeared in recent data. From around 2011 the cross-sectional link between age and well-being becomes a steady one in which older people report better well-being, and they replicate it across 34 countries for 2020 to 2024 using five ill-being measures. The driver is the young, whose reported mental health has worsened, not a sudden cheerfulness among the middle-aged. It is a working paper, not yet the final word either.

If that holds, the “U” turns into a slope. Midlife is then less a trough than a stretch where the pressure to be fine (kids, work, ageing parents) is high and the supply of new things is low.

Why would midlife feel flat in the first place?

The surveys measure that it happens, not why, and the explanations on offer are hypotheses. One common one, which Rauch leans on, is that expectations set in youth meet a more ordinary reality around the forties, and the gap shows up as dissatisfaction before it fades. Another is plain load: caring for children and parents while holding a career together leaves little room for anything unscheduled. A third, which no survey here tests, is that adult life gets thinner on firsts. The first apartment, the first job and the first long trip happen once, and by 47 most of the big ones are behind you.

What is a reasonable response to a contested curve?

Waiting for the data to settle, or for age 55 to arrive, is a poor plan. The dip, whatever its size, is an average; the flatness a person actually feels on a given Tuesday can be addressed this month.

Two modest ideas follow, neither of which the U-curve research tests. The first is scheduled novelty: a recurring slot for something with a small chance of surprising you, such as an unfamiliar route, a class, or a fifteen-minute awe walk. Novelty that waits for inspiration rarely turns up, and the longer guide on how to make life more exciting covers how to put it on a calendar. There is a trap in the forecast, too. Quoidbach, Gilbert and Wilson reported in Science in 2013 that people of every age expect to change little in the next decade, which is why the end-of-history illusion can make a flat patch feel permanent when it probably is not.

The second is a witnessed commitment. A plan that nobody else knows about is easy to drop, so tell someone, book it with a friend, or pay a deposit. DontSnooze is a blunt version of the idea: if you miss a 30-second wake-up video, a random camera-roll photo goes to your friends. It will not touch a midlife dip, and nothing in this literature says morning routines do. The narrower point is that people keep commitments someone else will notice, and a novelty plan is easier to keep when a friend is waiting at the trailhead.

Either way the plan is the same. If the U-curve is real, the flat stretch may lift by itself eventually. If the critics are right, there is even less reason to wait for it.