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Humanity has entered a frightening era: babies are disappearing from statistics. What once seemed a distant problem in China, Japan, or South Korea has now reached Brazil — and could brutally transform the country’s future.
For decades, the fear was overpopulation. Now, the warning is different: there are not enough children, there are too many elderly, and the planet is beginning to age at an unprecedented speed. In several countries, the question has ceased to be “how to control growth?” and has become “who will work, care for the elderly, and sustain the economy?”
The demographic bomb almost no one wants to see
The global birth rate crisis is neither a conspiracy theory nor an internet exaggeration. Studies published in the scientific journal The Lancet indicate that, by 2100, more than 97% of countries and territories may have fertility rates below the level needed to maintain stable populations.
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This means that much of the planet could enter a dangerous spiral: fewer births, fewer workers, less consumption, less revenue, and more pressure on pensions and healthcare systems.
The UN’s central forecast does not state that the world population will halve by 2100. But the warning is serious: the global population is expected to peak at around 10.3 billion in the 2080s and then begin to decline. In ultra-low fertility countries, however, the shrinkage can be devastating — and, in a few generations, lead national populations to lose a huge share of their inhabitants.
Brazil has already entered the danger zone
Brazil, long seen as a young, fertile country full of children, has changed its face. The decline has been violent. According to the IBGE, the Brazilian fertility rate plummeted from 6.28 children per woman in 1960 to just 1.55 in 2022.
This number is well below the so-called replacement rate, which is approximately 2.1 children per woman. In simple terms: Brazil no longer has enough children to replace its own population in the long term.
And the most shocking thing is that this happens without war, without natural disaster, and without a one-child policy. The decline stems from real life: tight salaries, expensive rent, difficult childcare, fear of losing jobs, late motherhood, and lack of support for raising children.
The country will stop growing — and then shrink
Official projections show a future that looks like a dystopian movie script. The Brazilian population is expected to stop growing around 2041, when it would reach approximately 220.4 million inhabitants. After that, it begins to decline, potentially reaching approximately 199.2 million in 2070, according to IBGE population projections released by Agência Brasil.
This means that Brazil is approaching a historic turning point: fewer children in schools, fewer young people entering the job market, and more elderly people depending on care, pensions, and public services.
The drama is that the country may age before it gets rich. Japan and Europe aged with high incomes. Brazil may face the same storm with inequality, informality, and pressured public services.
China, Japan, and Korea show the demographic horror film
China is the most explosive example. After decades of the one-child policy, the country tried to stimulate births, but couples did not respond as the government expected. The result was a dangerous combination of falling birth rates, gender imbalance, a singles crisis, and accelerated aging.
In Japan, the crisis is already visible on the streets: schools close, small towns empty, and the elderly occupy an increasingly larger share of the population. The country recorded the lowest number of births since the beginning of its historical series in 2024, according to the Associated Press.
In South Korea, the shock is even more extreme. Even with a small recent recovery, the fertility rate remains among the lowest in the world, around 0.80 children per woman, according to data cited by Channel NewsAsia.
Why are people giving up on having children?
The answer is harsh: having children has become an emotional, financial, and physical luxury. For millions of young people, starting a family is no longer a natural step in life and has become a high-risk decision.
The OECD points out that expensive housing, job instability, lack of childcare facilities, insufficient parental leave, and difficulty balancing career and family directly weigh on the decision to have or not have children.
In Brazil, this equation is even crueler. Many women study more, work more, and continue to bear the brunt of domestic care. Meanwhile, the cost of raising a child rises, the support network shrinks, and the fear of losing stability increases.
The future might be emptier than we imagine
The decline in birth rates doesn’t explode like a common bomb. It acts in silence. First, babies disappear. Then, school classes close. Next, workers are scarce. Then, the burden of the elderly grows. By the time society realizes it, the population pyramid has already turned upside down.
Brazil still has time to react, but not much. Without affordable childcare, decent housing, stable jobs, real parental leave, support for mothers, and a fair division of care, the trend is clear: the country will have fewer and fewer children.
And perhaps the biggest shock will be this: the problem of the future won’t be too many people. It will be discovering that, in many parts of the world, simply not enough people were born.
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