The Family Curve
Marriage, households, and the shape of everyday life have changed faster since the 1960s than at any point since the industrial revolution. The data on what is happening, before the politics of what should.
(28 for women, 31 for men - up from 20 and 23 in 1960)
(up from about 5% in 1960)
(a record, up from 6% in 1980)
A note on framing. Family is a topic where what people feel about the data often runs ahead of the data itself. The numbers below describe what has changed - they do not say whether the change is good or bad. The page walks through the most important measured shifts, what is contested, and what the practical consequences are for individuals and whole societies.
What has changed
The shape of daily family life has shifted dramatically in every developed country and increasingly in middle-income countries too. The shifts are remarkably consistent across very different cultures, which suggests they are driven by deep economic and social changes rather than by any single political or religious decision. Several of the largest changes:
The forecasts keep being revised in one direction. Something worth noticing about these curves before reading anything built on them: they have consistently fallen faster than demographers expected. The UN puts the world's fertility rate at 2.25 in 2024, down from 3.31 in 1990 (2.19 in the World Bank series above). Its 2024 projections put the global peak at about 10.3 billion people in the mid-2080s - earlier and lower than it expected a decade ago. Other forecasters go lower: in 2020 the Institute for Health Metrics and Evaluation projected a peak of 9.7 billion in 2064. The revisions have almost all gone the same way, which is the part that matters. Every scenario further down this page rests on a projection, and the projections have a track record of being too high rather than too low.
Marriage is later, and increasingly optional. The median age at first marriage has risen by roughly seven to nine years in most developed countries since 1960. American women now marry at a median age of 28 (up from 20); Japanese women at 30 (up from 24); Italian women at 33 (up from 24). The share of adults who never marry at all has also risen sharply - in the US, 25% of 40-year-olds had never been married in 2021, a record, up from 6% in 1980. Childlessness is rising too: 28% of Japanese women born in 1975 have no children, as do 24% in Spain and 23% in Italy (OECD).
Childbearing has separated from marriage. About 40% of US births today are to unmarried mothers. In France the figure is around 60%; in Iceland it approaches 70%, and across the other Nordic countries it runs from 48% (Finland) to 60% (Norway). In 1960 it was below 10% in almost every Western country. The change is not primarily about teenage motherhood (which has actually fallen) - it is about adult women in long-term cohabiting relationships having children without formal marriage.
Cohabitation has risen sharply. Living together without marriage has gone from being a minority practice to a near-universal stage of relationships in most developed countries. About two-thirds of US first marriages today are preceded by cohabitation. In France and the Nordic countries, formal marriage has become increasingly optional - many couples raise children together for decades without ever marrying.
Divorce rates rose, then fell. US divorce rates roughly doubled from 1960 to 1980, peaking around 1980. They have been falling slowly since then. Today the US divorce rate is back near the 1970 level. The story of "divorce keeps rising" is a 1980s story that newer cohorts are not living - though the marriage rate has fallen so much that the comparison is not entirely apples-to-apples.
Single-parent households have stabilized at a high level. About a quarter of US children (26% in 2025) live with one parent, usually their mother. That share nearly tripled between 1960 and 1990, then plateaued. Most other developed countries have followed similar patterns.
Family size has fallen at every income level. In almost every developed country the average woman now has fewer than two children; Israel, near 2.9, is the exception. In 2025 the fertility rate was 1.56 in France, 1.32 in Germany, 1.14 in Japan and Italy, and 0.80 in South Korea; the US rate hit a record low of 1.60 in 2024 (CDC). Three readings of the fall each have evidence. Pronatalists point to a gap between wishes and outcomes: in a 2025 UN Population Fund survey in 14 countries, one person in five did not expect to have the number of children they wanted. The economic reading points to cost: US childcare averaged $13,184 a year in 2025, about 10% of a two-parent household's median income and a third of a single parent's. The feminist reading points to who does the caring. Claudia Goldin finds the lowest fertility where fast postwar growth outran slow-changing gender norms, as in South Korea, Japan and southern Europe; in Japan and Italy women do about three hours more housework a day than men.
Why these shifts happened
No single cause explains the family curve. The changes are best understood as the cumulative result of several deep shifts that all happened roughly together starting in the 1960s and 1970s.
Women's education and work. The single biggest variable across all developed countries. As women got more education and entered the workforce in larger numbers, the financial and life-path reasons to marry early or at all changed dramatically. Women whose grandmothers had to marry at 22 to be financially secure could now choose differently and increasingly did.
Reliable contraception. The pill was approved in the US in 1960 and became widely available through the 1960s and 1970s. For the first time in human history, sex and reproduction could be cleanly separated. The downstream effects on dating, marriage, and childbearing took decades to fully play out and are still playing out.
The decline of the marriage premium. When marriage was the only socially acceptable path for adult women and the only stable way to raise children, the cost of staying single or divorcing was extraordinary. As social norms shifted and welfare systems expanded, the practical cost of being unmarried fell sharply. The change is not primarily ideological - it is structural, and it removed a powerful stabilizing force.
Economic stress at the bottom. Marriage rates have fallen most sharply for non-college-educated Americans. The reasons are debated but several converge. Men without college degrees have seen their real wages stagnate or fall over forty years, making them less attractive marriage partners by traditional standards. Women across the income distribution have gained education and earning power, and the kind of stable industrial jobs that supported the working-class American family in 1960 have largely disappeared. Marriage has become, increasingly, a pattern of educated and higher-income households.
Cultural and religious shifts. Most developed societies have become more secular, more individualistic, and more tolerant of family forms that would have been stigmatized in 1960. The mechanisms here are real but harder to measure. Religious participation correlates with more stable marriage across developed countries, though disentangling causation from selection (religious people differ from non-religious people on other dimensions that also predict stability) is hard. Whether secular substitutes can do the same job is one of the open questions of the next generation.
How countries compare
The shifts have happened in every developed country but the pattern, pace, and resulting family forms differ. The numbers below describe rough national averages and are approximate.
The takeaway: the direction of change is broadly similar across developed and middle-income countries, but the speed and the resulting forms vary widely. France and the Nordic countries have settled into a stable cohabitation-with-children pattern, and the US has fragmented along class lines. East Asia has trended toward marriage and children becoming rare and late, while Mediterranean Europe changed later and is now catching up. Much of Africa, the Middle East, and South Asia is on different trajectories with different starting points.
The paths from here
Dated September 2026, with South Korea's births rising for a third year and record-low births in Japan and Taiwan in 2025. Family forms tend to change slowly, in part because they are reproduced through how each generation is raised. The next twenty years are likely to look more like extensions of current trends than sharp breaks, but several different shapes are possible.
Continued slow drift
Marriage rates keep falling in most developed countries; cohabitation continues to expand; the age at first marriage and first birth keeps rising; the class gap in family stability stays wide. By 2040 marriage is a minority adult experience in most cohorts, though stable long-term partnership remains the norm.
Will it happen? This is the base case. The forces driving the trends - women's education and economic opportunity, cultural shift toward individual choice, falling religious participation, and economic stress at the bottom - are all still operating. None look likely to reverse soon.
Stabilization at current levels
The most extreme decline countries (South Korea, Italy, Spain) hit a floor as the social and economic costs of very-low marriage and birth rates become severe enough to provoke serious response. Marriage rates stabilize rather than continuing to fall. Other countries follow similar patterns at higher levels.
Will it happen? Possible, and South Korea is the test case: its marriages and births have risen since 2024. How much of that is policy and how much a passing cohort effect is not yet clear, and Italy's rate is still falling (1.14 in 2025). Many family-system researchers think a partial stabilization is more likely than a real reversal.
Class-based polarization deepens
The American pattern continues: highly-educated and higher-income families increasingly look stable and traditional, while less-educated and lower-income families increasingly raise children outside of marriage with high partnership instability. The two patterns become permanently divergent rather than the lower group catching up to the upper.
Will it happen? The US has been on this path for forty years and there are no obvious signs of convergence: in 2021 a third of 40-year-olds with no more than a high school education had never married, against 18% of college graduates. Several other developed countries (UK, Australia, parts of Eastern Europe) show signs of similar polarization. On current evidence the class-stratified family looks durable rather than temporary.
New forms of partnership emerge
Living-apart-together arrangements (couples who maintain separate households), legal civil partnerships short of marriage, multi-generational households, and intentional co-parenting arrangements among friends all become more common. The "marriage versus cohabitation" frame becomes less helpful as the actual variety of stable adult arrangements expands.
Will it happen? Already starting. France's PACS (civil partnership), Japan's growing single-person household share, and the rise of multi-generational households in expensive American metro areas all point in this direction. Whether these become the new norm or stay marginal depends on legal recognition and social acceptance.
Pronatalist policy bends the curve
Governments increasingly worried about demographics offer larger and more sustained packages of support for marriage, childbearing, and family life - direct cash benefits, parental leave, child allowances, housing subsidies, and tax preferences. France, Hungary, Japan, and South Korea have all spent meaningfully on this, and China began paying 3,600 yuan a year per child under three in 2025. Measured effects are modest: a 2021 review of 35 quasi-experimental studies found that childcare expansions raise completed fertility, while cash transfers have temporary effects.
Will it happen? Partly already happening, with mixed results. Hungary's rate rose from 1.23 in 2011 to 1.61 in 2021 as family support grew, then fell to 1.31 in 2025. South Korea's births are rising, though analysts credit demography and attitudes as well as policy. The US "Trump accounts", seeded with $1,000 by the Treasury for each American child born in 2025-2028, opened to contributions on July 4, 2026 - too recently to judge.
Continued slow drift is the base case for most developed countries. The class gap in stable family structure is unlikely to close without serious economic intervention at the bottom. Some stabilization in the most extreme decline countries is plausible. The new forms of partnership are already filling some of the space that traditional marriage used to occupy. None of this is likely to look much like 1960 again - the underlying changes in women's education, contraception, and economic structure have not reversed, and the family forms produced by those underlying changes are different from the ones they replaced.
Where serious analysts disagree
Family is one of the topics where analysts agree on more of the data than the political conversation suggests, and disagree more on what the data means. Each reading below is held by named scholars whose work is worth reading directly.
Family structure matters more than the tolerance framing admits
Children raised in stable two-parent households have better measurable outcomes - educational, economic, behavioral - than children in single-parent households, even controlling for income. This is not a moral claim; it is what the data shows across multiple countries and decades. Pretending otherwise to avoid stigmatizing single parents has costs of its own, particularly for the children whose outcomes are at stake.
Held by: Brad Wilcox (University of Virginia), Melissa Kearney (Maryland), and a substantial fraction of family-research sociologists. The outcome gaps are well documented; how much of them family structure itself causes is contested. Different researchers in this group reach different conclusions about what to do about it.
The decline-of-the-family framing is overstated
What is happening is not the decline of the family - it is the diversification of family forms. Stable cohabiting partnerships, blended families, multi-generational households, and adult-with-grandparent arrangements all play the role that marriage used to play, often with comparable stability. The "decline" framing measures only the marriage-shaped subset of what families actually are.
Held by: Stephanie Coontz (Evergreen State College), Philip Cohen (University of Maryland), and many family sociologists. Their data on the variety and stability of non-marriage arrangements supports them; the open question is whether the average outcomes (rather than the headline labels) actually look comparable.
The class gap is the deeper story
Both the "decline" and the "diversification" framings miss the most important pattern. The family experience of college-educated, higher-income Americans diverged from the family experience of less-educated, lower-income Americans starting around 1980, and the gap has widened ever since. The two groups now live increasingly different lives, with different family stability, different parenting, and different outcomes for the next generation.
Held by: Robert Putnam (Harvard, "Our Kids"), the late Sara McLanahan (Princeton), and a substantial fraction of inequality researchers. The class-and-family lens has become much more central in research over the last fifteen years; its proponents argue it explains more than the older framings do.
Women's preferences explain more than the structural framings allow
Stated preferences have changed dramatically over generations. In the US, 47% of childless adults under 50 say they are unlikely ever to have children, up from 37% in 2018, most often because they simply do not want to (Pew, 2024). Many of the family-curve trends reflect women choosing different lives than their grandmothers chose - not the simple result of structural constraints. Reducing the trends to economics, policy, or culture misses the reality that the preferences themselves have shifted.
Held by: Alice Evans, a tradition of preference-respecting feminism, and economists Melissa Kearney and Phillip Levine. They found no economic or policy factor that explains most of the US fall in births since 2007, and pointed to "shifting priorities". The implication is that policy aimed at "fixing" the family curve has limited room to operate without overriding what individual women actually want.
Family stability is a public-health-scale issue
The mental-health, educational, and economic consequences of family instability for children and adults are large enough that they should be treated as a major public-health concern, not as a private cultural matter. Underinvesting in the supports that promote stable family life - paid parental leave, accessible childcare, housing affordability, marriage-friendly tax policy - is a long-term cost the system is paying without acknowledging.
Held by: Kathryn Edin (Princeton), Brad Wilcox, and a coalition of researchers from across the political spectrum. The framing is unusual because it cuts across left and right - both sides have a version of this argument with different policy prescriptions.
What the available evidence supports: family forms have shifted in ways that reflect both expanded individual choice and structural pressures. Children's outcomes differ measurably with family circumstances, though how much family structure itself causes is disputed. The differences fall unequally across class and race, and the right policy response is contested among careful researchers in ways that do not map cleanly onto left-versus-right politics.
What this means for you
Family choices touch every reader directly in ways most other Now topics do not. Some practical observations that are useful regardless of one's political or religious views:
If you are choosing a partner
The data strongly suggests that the quality of a long-term partnership matters more for life satisfaction than almost any other variable - more than career success, more than wealth, more than residential location. Choosing a partner well is one of the highest-leverage decisions an adult makes. The qualities that predict stable partnerships (kindness, respect, shared values, reasonable conflict-resolution skills) are themselves more predictive than money, looks, or any of the variables that dating culture tends to overweight.
If you are deciding whether to have children
The decision is more personal than almost any other on this site, and it is yours alone. What is worth knowing: parenting is harder than most people expect, more rewarding than most people expect, and for most parents one of the things they look back on as among the most meaningful parts of their lives. The economic and career costs are real and measurable. The emotional and developmental returns are real and harder to measure. The decision should be made on what you and your partner actually want, not on what you feel pressured to want by demographic worry, pronatalist policy, or career anxiety in the other direction.
If you are raising children
Stability of the home matters substantially - more than household structure type, more than household income above a basic threshold, more than the specific choices about education or activities. Children do well when adults around them are reliable, attentive, and emotionally regulated. They do less well when those adults are unstable, distracted, or in conflict. The single most important parenting input is reducing chronic stress in the household, which compounds over years in measurable ways.
If you are single
Long-term singlehood is now common enough that the social infrastructure for living alone successfully is much better than it used to be - financially, socially, and culturally. The mental-health consequences of long-term loneliness are real, however, and worth taking seriously. Friendship networks, community involvement, and physical health habits are particularly important for long-term singles. The "find a partner" advice that older generations defaulted to is not the only option, but the underlying need for sustained meaningful relationships is universal whether they are romantic or not.
If you are thinking politically
Family policy is one of the few areas where serious people across the political spectrum can agree on a meaningful subset of policies (paid parental leave, expanded child tax credits, child-care support) even when they disagree about deeper questions of marriage, gender roles, or religious values. The pragmatic case for supporting families regardless of structure - because the children's outcomes matter to everyone - is one of the more under-utilized pieces of common ground in contemporary politics. Voting on the merits of specific policies rather than on slogans about family decline or family freedom tends to be more useful than the political conversation suggests.
The mechanics behind this
The family curve sits on top of three deeper mechanisms covered elsewhere on this site. If the analysis above depends on ideas you want to understand first, these fundamentals make the conversation more legible:
