The Arrival of an Aging World: "A World with More Elderly than Children" — What Can Japan, Which Has Seen This Future First, Teach Us?

The age composition of humanity has crossed a historical boundary.

Currently, there are more people aged 65 and over in the world than there are children under five. According to the report "An Aging World: 2025" published by the U.S. Census Bureau in August 2026, this reversal actually occurred in 2023. By 2025, those aged 65 and over accounted for about 10.5% of the global population, reaching approximately 852 million people.

The New York Post reported this fact as a "first in human history." Just reading the headline might make it seem as if there was a sudden surge in the elderly population. However, population structures do not reverse overnight. This is the result of decades of declining infant mortality rates, improvements in healthcare and sanitation, the spread of education, economic development, and a recent sharp decline in birth rates.

This phenomenon cannot be dismissed with a simple statement that "there are too many elderly people." It is a simultaneous manifestation of the human achievement of more people living longer and the societal change of rapidly decreasing births. If we only speak of aging as a crisis, we lose sight of the value of longevity, and if we only celebrate the success of longevity, we overlook the reality of dwindling workforce, caregiving personnel, and social security resources.

And the country that has been experiencing this complex future ahead of the world is Japan.

The "population reversal" that arrived earlier than expected

For a long time, the central theme of global population issues was "overpopulation." In the latter half of the 20th century, warnings about population explosions and food shortages were issued, and some countries adopted birth control measures. However, as we entered the 21st century, the focus of the issue began to shift rapidly.

According to the U.S. Census Bureau report, in 2023, 71% of the world's population lived in countries or regions with birth rates below the population replacement level of approximately 2.1 children per woman. In 2013, this figure was 45%, indicating that in just ten years, low birth rates were no longer a phenomenon unique to developed countries.

Even populous countries like China, India, Bangladesh, Mexico, and Vietnam have birth rates below the replacement level. Urbanization, the expansion of women's education and employment, rising marriage and childbirth ages, the burden of housing and education costs, long working hours, and the diversification of values all interact in complex ways. It is not a simple change that can be reversed by a single cause or a one-time financial incentive.

On the other hand, more people are surviving infancy and living longer, healthier lives. In other words, while the base of the population pyramid is narrowing, the upper part is thickening. The report's "fertility trap" refers to the structure where, due to continued low fertility rates, the very generation that would become future parents decreases, making it difficult for the total number of births to increase even if the number of births per person slightly recovers.

Measures against declining birth rates are not policies where the water flow returns immediately when the tap is turned. Even if the number of births increases, it takes about 20 years for those children to become part of the workforce. Population policies must simultaneously invest in future generations and adapt to the already nearly fixed age composition.

By 2060, one in five people in the world will be 65 or older

This turning point is just the beginning.

The global population aged 65 and over is projected to increase from approximately 852 million in 2025 to about 2 billion by 2060. The growth rate is about 135%, with the elderly accounting for about 55% of the increase in the global population during this period. While the total world population is expected to grow from about 8.1 billion to about 10.2 billion, the age composition will change significantly, with approximately one in five people being 65 or older by 2060.

This change is not limited to Europe and North America. The largest increase in numbers is expected in Asia, where the population aged 65 and over is projected to swell from about 487 million in 2025 to about 1.24 billion by 2060. Even in Africa, currently the youngest region, the population is expected to increase more than fourfold from about 60 million to about 249 million during the same period, surpassing the elderly population of Europe.

This regional difference is significant. Wealthy countries have reached aging with pension, healthcare, and caregiving systems, albeit imperfectly, in place. Some low- and middle-income countries, which are about to age rapidly, face an increase in the elderly population without sufficient social security or healthcare infrastructure, along with a reduction in family size. If more countries "age before becoming wealthy," there is a risk of exacerbating family caregiving burdens, unpaid labor by women, and urban-rural disparities.

The global average numbers do not reveal the disparity between the "speed of aging" and the "economic power to prepare."

In Japan, the future has already become the present

For Japanese people, the global population reversal is not distant news.

According to the Statistics Bureau of Japan, as of October 2024, Japan's total population was about 123.8 million, with 36.24 million people aged 65 and over, accounting for 29.3% of the total population. Those under 15 years old numbered 13.83 million, or 11.2%. While the world has just seen those aged 65 and over surpass those under five, in Japan, even when comparing the broader categories of "65 and over" and "under 15," the former exceeds the latter by more than 2.6 times.

The decline in births has not stopped. According to preliminary figures from the Ministry of Health, Labour and Welfare's 2025 Vital Statistics, the number of births in Japan was 671,236, marking the lowest number for the tenth consecutive year. The total fertility rate was 1.14. The number of deaths was 1,589,489, resulting in a natural decrease of 918,253, equivalent to the population of a designated city lost in one year.

According to the medium projection by the National Institute of Population and Social Security Research, Japan's total population is expected to decrease to about 87 million by 2070, with the proportion of those aged 65 and over rising to 38.7%. The population aged 15 to 64 is projected to decrease from about 75.09 million in 2020 to about 45.35 million in 2070.

However, it is important to note the outdated framework that considers all those aged 15 to 64 as "supporters" and all those aged 65 and over as "dependents." In Japan in 2025, those aged 65 and over accounted for 13.7% of the labor force, with employment rates of 54.5% for those aged 65 to 69 and 36.2% for those aged 70 to 74. Healthy elderly individuals are workers, consumers, taxpayers, and contributors to family childcare and community activities.

What is needed is a shift from the idea of determining social roles based solely on chronological age. However, this does not mean reducing pensions and forcing people to "work until they die" regardless of their will or health. It is necessary to create an environment where those who wish to work can utilize their abilities and those who cannot work can live with dignity.

Three reactions on social media—crisis, counterargument, adaptation

Since this news was just announced, it is not yet possible to evaluate social media reactions as a statistical public opinion. In reality, on platforms like X and Bluesky, the fact of the "first-ever reversal" and graphs were initially spread, with posts sharing surprise being predominant. Meanwhile, when looking at existing discussions on platforms like Reddit that deal with population aging, reactions can be broadly divided into three categories.

The first is a sense of crisis about who will support pensions, healthcare, and caregiving. Concerns such as "If retirees increase and workers decrease, the system cannot be maintained" and "There will be a shortage of caregiving personnel" are strong. For those familiar with Japan's caregiving field and local transportation situation, this is not an abstract discussion. Labor shortages are already becoming apparent in essential services like hospitals, caregiving facilities, logistics, construction, and public transportation.

The second is the debate over the causes of declining birth rates. Voices cite housing costs, stagnant wages, childcare and education expenses, and long working hours, blaming a society where "even if people want children, they cannot have them." On the other hand, there is a counterargument pointing out the tendency for birth rates to decline as income increases and education levels rise, arguing that financial assistance alone will not restore birth rates. Neither side is entirely correct. Economic constraints and changing values coexist, with their significance varying by country and class.

The third is a reaction that does not necessarily view aging as a catastrophe. Comments include "It's a result of being able to live longer," "Environmental impact is smaller than if the population continued to grow indefinitely," and "Society can adapt through automation, immigration, and changes in work styles." Additionally, there is a cautious view that future projections are merely scenarios based on current trends, and outcomes may change if technology, systems, or migration patterns shift.

These posts are not randomly sampled public opinion surveys but merely some opinions from English-speaking social media users. Nevertheless, the structure of the debate is quite similar to that in Japan. Whether to place the elderly and young people in a competition for resources or to rebuild the living foundation across generations is a political issue the world will face in the future, as foreshadowed by social media conflicts.

What Japan can show the world is not just "success stories"

Japan is not the completed form of aging but is at the forefront of trial and error. What it can offer the world are not only successful systems but also lessons learned from delayed responses and unmet policies.

The first lesson is not to reduce the issue of declining birth rates to merely encouraging childbirth. Conditions that make life planning difficult, such as young people's take-home pay, stable employment, housing, childcare, education costs, long working hours, and gender disparities in household and childcare responsibilities, must be collectively improved. Whether to have children or not is an individual choice, and the policy's goal is not to force births but to create an environment where those who want children do not have to give up for economic or professional reasons.

The second is to place "healthy life expectancy" as the central indicator of society. If only lifespan extends while the periods of illness or isolation lengthen, neither personal happiness nor societal sustainability will increase. Investments in preventive healthcare, exercise, diet, early diagnosis, community connections, and age-appropriate home renovations not only curb medical and caregiving costs but also extend the period during which the elderly can actively live in their own way.

The third is to align employment with ability and desire rather than age. In companies that assume seniority-based wages and mandatory retirement, longevity can easily be seen as a "cost of continued employment." By clarifying job roles and combining part-time work, retraining, equipment to reduce physical strain, and intergenerational skill transfer, experience can be transformed into productivity. The IMF also analyzes that improving health conditions and expanding employment opportunities for the elderly can significantly mitigate the growth-dampening effects of population aging.

The fourth is to use AI and robots not merely as tools for workforce reduction but as "technologies that support people." If automation can be applied to caregiving records, transportation, monitoring, diagnostic support, administrative procedures, and logistics, limited human resources can be directed to jobs requiring interpersonal care and judgment. However, if digitalization excludes the elderly or disabled from services, it will have the opposite effect. It is necessary to retain face-to-face and telephone options and ensure usability from the design stage.

The fifth is not to treat immigrants as temporary "fillers for labor shortages." Accepting foreigners will become important to supplement Japan's labor shortage, but if only low-wage temporary labor is sought, they will not settle. It is necessary to have systems that welcome them as community members, including Japanese language education, family accompaniment, children's education, housing, vocational training, and pathways to permanent residency. Population decline cannot be solved by immigration alone, but it is also difficult to mitigate the impact without it.

Not "schools or nursing homes," but "shared communities"

Changes in population composition will alter the landscape of towns before affecting national pension systems.

As the number of children decreases, school consolidations will progress, and as the elderly population increases, support for transportation to medical appointments and shopping will be needed. While the number of vacant homes increases, there is a shortage of barrier-free housing near stations and hospitals. With municipal tax revenues dwindling, the idea of maintaining separate facilities for childcare and caregiving, schools, and elderly facilities has its limits.

What becomes important is public spaces that do not separate generations. Empty classrooms can be used for childcare consultations, elderly exchanges, remote medical care, and retraining functions. Shuttle vehicles can be shared by children and the elderly at different times. The elderly can support after-school activities, and young people can assist with digital usage. These small points of contact not only reduce facility costs but also have the potential to reduce loneliness and intergenerational distrust.

We must move beyond the zero-sum thinking that "if the budget for the elderly increases, the budget for children decreases." Compact towns that are easy to raise children in are also easy for elderly people who cannot drive to live in. Housing without steps, easy-to-understand administrative procedures, and flexible work systems benefit people with disabilities, caregivers, and families with children. A society that is kind to age is often a society that is kind to everyone.

The "silver economy" can become a huge market

Aging has a fiscal burden aspect, but demand does not disappear. The content of consumption changes.

New demands will arise not only in healthcare, caregiving, prevention, home renovations, mobility, finance, and security but also in travel, learning, entertainment, sports, fashion, and community services. Companies that pigeonhole the elderly as a single type of customer who "receives care" will miss opportunities. The health, assets, and preferences of a 65-year-old and a 95-year-old differ greatly, and even the same person will have changing support needs as they age.

For Japanese companies, there is significant potential to expand products and services honed domestically to rapidly aging Asia, Latin America, and future Africa. User-friendly small mobility, monitoring technology, labor-saving caregiving, remote medical care, designs that support cognitive functions, and financial services that prevent fraud could become industries that address common global challenges.

However, the "silver economy" must not become a "fear market" that sells products by stoking the anxieties of the elderly. Whether it increases the independence, choice, and dignity of individuals will determine the quality of the silver economy.

What is being questioned is not the number of elderly people but the design of society

The fact that those aged 65 and over have surpassed those under five is a powerful symbol. However, since the under-five group includes six years of age and the 65 and over group includes several decades, it is not possible to judge the quality of society based solely on numerical comparisons. What is important is not the reversal itself but the speed at which it occurs and whether systems can keep up afterward.

The world is moving away from the 20th-century assumption that "the young population continues to grow, and workers support retirees." Japan experienced this change early. Even so, it is hard to say that it has sufficiently addressed the decline in births, intergenerational distrust in social security, shortages of caregiving personnel, and the shrinking of rural areas. On the other