India passed China, and is already slowing down
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2026-07-26
India became the world's most populous country around 2023, and the milestone hid a quieter fact: Indian fertility had already dropped to about 2.0 births per woman, below replacement.
Momentum will keep the total rising for decades, probably to a peak near 1.7 billion in the 2060s. But the growth engine is switching off, state by state; Kerala and Tamil Nadu have birth rates that would look at home in Europe, while Bihar and Uttar Pradesh still run higher.
One country, two demographic eras, sharing a railway system.
The quiet crossover
Sometime around April 2023, by UN reckoning, India's population slid past China's — the first change at the top of the table since the UN began keeping it. The symbolic weight was enormous; the demographic reality was almost anticlimactic, because the forces that produced it had been in motion for half a century. China's fertility collapsed early and hard; India's declined steadily and late.
A country of demographic time zones
Averages flatten India misleadingly. Kerala and Tamil Nadu completed their fertility transitions decades ago and now face aging questions that would look familiar in southern Europe. Bihar and Uttar Pradesh, with over 350 million people between them, still run well above replacement. The result is an internal migration economy: young workers from the northern heartland staffing the factories, kitchens and construction sites of the older, richer south and west. India contains both halves of the global demographic story inside one border.
The window that matters
India's working-age share will keep rising into the 2040s — the classic dividend window. The catch, as always, is employment: the economy needs to generate on the order of eight to ten million jobs a year to absorb new entrants, and female labour-force participation remains among the lowest of any major economy. Get those two numbers right and the crossover becomes the foundation of an economic era. Miss them, and the world's largest population becomes the world's largest missed opportunity. The census, delayed since 2021, will eventually tell us how the story is actually going.
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