Period childlessness, a measure of the share of women who would remain childless if current age-specific birth patterns persisted throughout their reproductive lives, has risen in every country where it can be calculated, reaching roughly a quarter in several Western countries, more than a third in Finland, Japan, and Spain, and 45% in South Korea, according to 2026 demographic research. In the United States, 52% of women aged 20 to 39, 23.1 million people, had not yet had a child as of 2024, with 5.7 million more childless women in this age group than prior fertility patterns would have predicted, up sharply from 2.1 million in 2016.
These are not simply fertility statistics. They describe a structural shift in the size of the family networks people can expect to have available to them across their lives, the number of children, and eventually grandchildren, siblings, and extended relatives who have historically formed the core of informal social and caregiving support.
What Counts as a Close Family Network?
For the purposes of this article, a close family network refers to living relatives with whom a person maintains meaningful contact and could reasonably expect to provide or receive support, typically parents, children, siblings, and, increasingly relevant given rising longevity, grandchildren and great-grandchildren.
This is distinct from household composition, since family network size does not depend on co-residence; a person can have an extensive, supportive family network while living alone, and a person can live with family while having limited functional support from them.
Why Family Networks Are Becoming a Demographic Issue
Three converging trends are reshaping the size of family networks across most high-income and a growing number of middle-income countries:
- Rising childlessness, reducing the number of people who will have children, and by extension grandchildren, as part of their family network in later life.
- Falling fertility even among parents, meaning those who do have children increasingly have fewer of them, shrinking sibling networks for the next generation.
- Longevity extending overlap between generations, which somewhat offsets network shrinkage by keeping existing family members alive and available for longer, even as the total number of family members declines.
Who Is Most Likely to Have Small Family Networks?
U.S. Census Bureau Current Population Survey data on childlessness by age shows the scale of change over just the past decade: among women aged 20 to 24, the childless share rose from 75% in 2014 to 85% in 2024. Among women 25 to 29, it rose from 49.6% to 63%.
Among women 30 to 34, it rose from 28.9% to 40.3%. Smaller but still significant increases occurred among women 35 to 39 (18.5% to 23.2%) and 40 to 44 (15.3% to 18.8%), while childlessness among women 45 to 50 actually declined slightly, from 16.7% to 14.9%, suggesting modestly more women are having children later in life even as childlessness rises sharply at younger ages.
Period Childlessness by Country, Recent Estimates
| Country | Approximate Period Childlessness Rate |
|---|---|
| South Korea | 45% |
| Spain | Over one-third |
| Finland | Over one-third |
| Japan | Over one-third |
| United States | Roughly a quarter (national average); 52% among women aged 20-39 specifically as of 2024 |
| Germany | Roughly a quarter |
| Italy | Roughly a quarter |
| United Kingdom | Roughly a quarter |
| Several other Western European countries | Roughly a quarter |
Note: “Period childlessness” is a projection based on current age-specific birth patterns, not a completed-cohort measurement, and estimates vary by methodology and source year. The United States figure for women aged 20-39 reflects current, not completed, childbearing status and is not directly comparable to the period childlessness estimates for other countries listed. Source: Baudin, de la Croix & Gobbi, “The Economics of Childlessness,” 2026; U.S. Census Bureau Current Population Survey, 2024.
U.S. Childlessness by Age Group, 2014 vs. 2024
| Age Group | Childless Share, 2014 | Childless Share, 2024 | Change |
|---|---|---|---|
| 20–24 | 75.0% | 85.0% | +10.0 pts |
| 25–29 | 49.6% | 63.0% | +13.4 pts |
| 30–34 | 28.9% | 40.3% | +11.4 pts |
| 35–39 | 18.5% | 23.2% | +4.7 pts |
| 40–44 | 15.3% | 18.8% | +3.5 pts |
| 45–50 | 16.7% | 14.9% | -1.8 pts |
Source: U.S. Census Bureau, Current Population Survey Fertility Supplement, 2014 and 2024.
Beyond age, several other groups face documented risk of smaller family networks: never-married individuals, people who experience infertility (affecting an estimated 2.1% to 8% of women across studied countries, according to Generation and Gender Survey research), and people whose siblings, if any, have relocated geographically.
Aging Without Children
Rising childlessness has direct implications for how people are supported in old age, since adult children have historically been among the most common sources of informal eldercare, documented in detail in coverage of the global care economy. It is important not to assume, however, that having children guarantees care in old age, or that childlessness guarantees its absence, geographic distance, family relationship quality, and the availability of alternative support networks all mediate the actual relationship between childbearing and later-life support far more than childbearing status alone.
Geographic Mobility Can Separate Families
Even where children exist, internal and international migration increasingly separate family members geographically, reducing the practical availability of family support regardless of family size on paper. This dynamic, where adult children live in a different city, region, or country from aging parents, is a documented contributor to reduced informal caregiving capacity identified by OECD researchers examining the broader decline in family-based eldercare, alongside falling fertility and rising female labor force participation.
What Happens When Family Support Is Limited?
As family networks shrink or become geographically dispersed, several alternative support systems become more central: formal paid care services, community and civic organizations, friendship networks (sometimes described by researchers as “chosen family”), and public social services designed to fill gaps traditionally covered by family.
Countries with strong public long-term care systems and community support infrastructure, generally the same higher-income countries where family networks are shrinking fastest due to low fertility, are, not coincidentally, further along in building institutional alternatives to family-based support than countries where extended family networks remain the norm.
Measuring the Population Without Close Family
Quantifying the global population without meaningful family support is difficult, and no single internationally comparable statistic captures it directly. Researchers instead rely on proxy measures, childlessness rates, sibling counts, household composition, and self-reported social network surveys, each of which captures only part of the picture.
Childlessness statistics measure a specific and reliably documented input into family network size, but they do not, on their own, measure family network adequacy, since a childless person with several siblings and strong friendships may have more functional support than a parent with one estranged adult child.
Future Family Network Demographics
Given that period childlessness has risen in every country where researchers have been able to calculate it, reaching a quarter or more of women in several Western countries and 45% in South Korea, and that U.S. childlessness has risen sharply across nearly every age group under 45 in just the past decade, the trajectory points toward smaller average family networks for future cohorts of older adults, absent a reversal in current fertility timing patterns. Longevity gains partially offset this by keeping existing family members alive longer, but cannot fully compensate for fewer family members existing in the first place.
Conclusion
Family network size is quietly becoming one of the most consequential demographic variables shaping how people will be supported in old age, and the data points in a consistent direction: rising childlessness, now documented across every country where it can be measured, is shrinking the family networks available to a growing share of the population.
The 52% of American women aged 20 to 39 without children as of 2024, and the sharp increases in childlessness across nearly every age group under 45 over just the past decade, signal that this is not a marginal or temporary shift but a structural change in family demography that formal care systems, community institutions, and public policy will increasingly need to account for.
Key Findings
- Period childlessness has risen in every country where it can be measured, reaching roughly a quarter in several Western countries, over a third in Finland, Japan, and Spain, and 45% in South Korea.
- In the U.S., 52% of women aged 20 to 39, 23.1 million people, had not yet had a child as of 2024, with childlessness rising sharply across every age group under 45 over the past decade.
- U.S. childlessness among women 20–24 rose from 75% to 85% between 2014 and 2024; among 25–29-year-olds, from 49.6% to 63%.
- An estimated 2.1% to 8% of women across studied countries report infertility experience contributing to childlessness.
- Geographic mobility increasingly separates family members even where children exist, independently reducing practical family support availability.
- Childlessness among U.S. women 45–50 modestly declined between 2014 and 2024, suggesting some women are having children later rather than not at all.
Frequently Asked Questions
1. What is a family network?
The set of living relatives, typically parents, children, siblings, and grandchildren, with whom a person maintains meaningful contact and could reasonably expect mutual support, distinct from household composition.
2. How many people have no close family?
No single global statistic captures this directly, but rising childlessness, now around a quarter or more of women in several Western countries and 45% in South Korea, is a key contributing factor to shrinking family networks.
3. How does childlessness affect family networks?
It directly reduces the number of children, and eventually grandchildren, a person has as part of their family network, while also shrinking sibling networks available to the next generation.
4. What happens when older adults have no children?
Support needs typically shift toward formal care services, community organizations, friendship networks, and public social services, though having children does not guarantee support just as childlessness does not guarantee its absence.
5. Can friends replace family support?
Researchers increasingly document “chosen family” and friendship networks as meaningful sources of support, though the availability and reliability of such networks varies significantly by individual and community.
6. Is childlessness rising everywhere?
Research shows period childlessness has risen in every country where it can currently be measured, though the pace and current level vary substantially, from roughly a quarter in several Western countries to 45% in South Korea.
7. How is childlessness different from infertility?
Childlessness describes the outcome of having no children, which may result from choice, delayed childbearing that becomes permanent, or infertility; researchers estimate 2.1% to 8% of women across studied countries specifically report infertility experience.
8. Does migration affect family networks?
Yes. Even where children and other relatives exist, geographic mobility increasingly separates family members, reducing the practical availability of family-based support independent of family size.
9. Is U.S. childlessness rising at every age?
Nearly every age group under 45 has seen rising childlessness over the past decade, though childlessness among women 45–50 modestly declined, suggesting some women are having children later rather than remaining permanently childless.
10. What replaces family support when family networks shrink?
Formal paid care services, community and civic organizations, and public social protection systems increasingly fill gaps traditionally covered by family, particularly in higher-income countries further along this demographic trajectory.
Sources
- Baudin, T., de la Croix, D., & Gobbi, P.E., “The Economics of Childlessness,” LIDAM Discussion Paper, 2026.
- University of New Hampshire, Carsey School of Public Policy, Kenneth M. Johnson, “Childlessness Surging in the U.S.,” Research Brief, September 2025.
- U.S. Census Bureau, Current Population Survey Fertility Supplement, 2014 and 2024.
- OECD, informal care supply research (family dispersion, fertility, and eldercare).
- Generation and Gender Survey II, biological childlessness and infertility research, presented at International Symposium on MAR, 2024.
