Imagine that the decline turns. Young adults begin marrying a little earlier. More couples have the child they once postponed, and fertility rises toward replacement. The annual birth count stops setting records in the wrong direction. This is the future I hope for. It is also a future in which the aging already built into the population keeps going for decades.
A recovery would probably arrive as several ordinary changes reinforcing one another. A couple can afford a home before thirty. Their employers no longer treat a child as evidence that serious work is over. Their parents live close enough to help, and their friends regard marriage and children as a normal adult ambition. Better treatment restores some births that infertility would have prevented. Policy can clear obstacles around this household, while culture supplies a reason to cross the threshold.
No government has yet assembled these pieces into a durable return from very low fertility to replacement. The United Nations found historical rebounds in 39 countries and territories, but its model does not assume that those rebounds continue above replacement. In countries whose populations have already peaked, its central projection reaches only about 1.4 births per woman in 2100. Recovery is possible. We don’t yet know how to produce enough of it.
A rebound that lasts
The first encouraging number would need careful reading. When births postponed during a recession or pandemic occur a year later, the total fertility rate can jump without much change in the number of children women eventually have. Researchers comparing ten wealthy countries found that later births made up some of the delay, though the catch-up was usually too small to restore completed fertility. A few good years would be welcome. They wouldn’t settle the question.
A durable recovery appears in cohorts. Women born in one decade finish their childbearing years with more children than the cohort before them, and the rise continues among those who follow. Fewer people reach their late thirties needing both a relationship and luck to deliver a first child quickly. This is slower to measure than a period rate, which is one reason a serious recovery will require patience without complacency.
The path needn’t reproduce the baby boom. Replacement is a reasonable long-run direction because it lets generations renew themselves without requiring permanent inflows from somewhere else. A country moving from 1.2 to 1.7 has still accomplished a great deal. It has not completed the work.
The old age structure remains
Suppose fertility reached replacement next year. The new babies would need about two decades before most entered full-time work. During those years they would require care and classrooms while the large older cohorts continued into retirement. Recovery initially adds children to the dependency burden before it adds workers. That is a good expense, but it is an expense all the same.
The missing cohorts between the baby boom and the recovery remain missing. A revived elementary school may have a busy kindergarten while its town still lacks thirty-five-year-old nurses. A family with three young children may also be caring for four elderly parents because the middle generation is small. Productivity and later retirement still have work to do during the passage. Recovery changes the destination before it relieves the journey.
After five generations, the picture is different. A stable run of renewing cohorts can rebuild age balance and give local institutions confidence that a temporary reopening will not be followed by another closure. The country will probably be smaller and older than it would have been without the decline. It can nevertheless become a society whose future is no longer narrowing by default.
That future begins rather quietly. A birth registry turns upward. Then the same change arrives at a school, a workplace, and a family table years apart. Demography imposed the delay; no slogan can remove it. The consolation is that a recovery allowed to mature becomes an inheritance rather than a brief statistical event.
Citations
- United Nations Department of Economic and Social Affairs, Population Division, World Population Prospects 2024: Methodology of the United Nations Population Estimates and Projections, 2024.
- United Nations Department of Economic and Social Affairs, Population Division, World Population Prospects 2024: Summary of Results, 2024.
- Eva Beaujouan, Kryštof Zeman, and Mathías Nathan, “Delayed First Births and Completed Fertility Across the 1940–1969 Birth Cohorts”, Demographic Research 48, 2023.