In a Tokyo department store, the shelf space once reserved for baby nappies has been quietly taken over by adult incontinence products. The shift, noted by analysts in Buenos Aires, is not a marketing whim but a ledger entry in a planetary reordering: Japan, the world’s most aged society, now sells more nappies for the elderly than for infants. Factories that once moulded plastic toys have retooled their lines for walking frames and fall-detection sensors. It is a detail that arrives without sirens, yet it captures a transformation that is touching every continent, from the classrooms of Colombia to the maternity wards of Sweden.

In Colombia, the numbers are stark but the silence is louder. A report from the Pontificia Universidad Javeriana’s Labour Economics Laboratory found that between 2015 and 2025, the education system shed nearly 920,000 students from preschool through secondary school. The demographic explanation—a birth rate that has collapsed from 6.8 children per woman in the 1960s to barely 1.0 in 2025—accounts for only part of the emptying. In preschool, the population of three- to five-year-olds dipped just 2% between 2018 and 2024, yet enrolment fell 7.8%. In primary, a 2.7% population drop accompanied a 6.7% enrolment slide. Researchers in Bogotá point to a tangle of forces: teenagers drawn into informal labour to shore up household incomes, forced recruitment by armed groups in rural regions, and a growing exodus of young Colombians pursuing university degrees in Spain, Australia, or Germany. The absent pupils are not simply unborn; they are elsewhere, or they are working, or they are hidden in a homeschooling sector that the state does not measure.

Viewed from Stockholm, the demographic anxiety takes a different shape. Sweden’s government has doubled the number of publicly funded in-vitro fertilisation attempts, arguing that economics should not stand between citizens and the families they desire. Yet a concurrent investigation by Swedish media revealed that most add-on IVF treatments offered by private clinics lack any proven effect on fertility. Critics in the Swedish debate, including voices from the Left Party, contend that subsidising IVF treats a symptom while ignoring the deeper drivers: a fertility decline that remains unexplained, and a society where many postpone childbearing without fully grasping the risks. The same Left Party, however, finds itself accused by liberal commentators of restricting women’s choices through proposals for mandatory equal sharing of parental leave and the abolition of tax deductions for domestic services that predominantly employ working-class women. The Swedish conversation, like the demographic curve itself, is caught between the desire to engineer outcomes and the stubborn persistence of individual preference.

In Quebec, the statistical institute projects that population growth will slow markedly, with the island of Montreal possibly returning to its 2016 level by 2051. The decline is driven not only by fewer births but by a planned reduction in temporary immigration. Meanwhile, Argentina contemplates a future where, by 2040, over-65s will outnumber children under 14, and the “silver economy”—health tech, adapted housing, tourism for the over-60s—is already being sized up as a sector worth trillions globally. The same demographic arithmetic that empties school benches in Medellín is filling geriatric wards in Córdoba and reshaping household consumption from Milan to Osaka.

In a Colombian school, a teacher erases a name from the register. The chalk dust settles on a desk that has been empty for months. No one is certain whether the child has moved, migrated, or simply stopped coming. The silence in that room is the same silence that hangs over the adult nappy aisle in Tokyo: a quiet, planetary recalibration that is rearranging the furniture of everyday life long before most governments have opened the door.