World Population Day: How demographics are reshaping geopolitics, economics, security and global power

The world's population has crossed 8.3 billion in 2026, but the story beneath that number is one of division, not uniformity.

Some nations are young and growing; others are shrinking and ageing. This split is increasingly shaping global politics, economic growth, military power and international relations.

The global growth rate now stands at approximately 0.83-0.84 per cent a year, well below the 2 per cent peak of the mid-1960s. The global fertility rate has more than halved since the 1960s, falling from over 5 children per woman to roughly 2.3 today. But averages hide sharp regional contrasts, and these contrasts are now shaping how countries perform economically and behave strategically.

Ageing Europe faces economic and security challenges

Europe is among the regions most affected by demographic ageing. According to Eurostat, the European Union's median age has risen to nearly 45 years, while fertility rates remain well below the replacement level of 2.1 children per woman.

An ageing population is placing increasing pressure on pensions, healthcare systems and labour markets.

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The Russia-Ukraine war has also highlighted another consequence of ageing populations. Sustaining military recruitment and replacing battlefield losses has become increasingly difficult in countries with shrinking pools of young adults.

Ukraine has repeatedly lowered the age threshold for mobilisation, while Russia has relied on recruitment drives, financial incentives and prison enlistment to replenish its forces.

Asia presents two contrasting demographic stories

Asia illustrates the world's demographic divide more clearly than any other region.

India, now the world's most populous country with around 1.46 billion people, has one of the youngest major workforces, with a median age of about 29 years. The International Monetary Fund continues to project India among the world's fastest-growing major economies, supported by domestic demand and a growing labour force.

China, however, faces the opposite challenge. After decades of the one-child policy and falling birth rates, its population has begun to decline. The country's fertility rate remains among the world's lowest, while its workforce is shrinking and the share of elderly citizens is rising. These trends are expected to weigh on long-term economic growth, manufacturing competitiveness and defence planning despite government efforts to encourage larger families.

Japan and South Korea face similar demographic pressures, with South Korea recording one of the world's lowest fertility rates.

Africa's rise and the global labour map

Africa remains the fastest-growing region worldwide, with its population projected to nearly double by 2050.

Median ages across much of sub-Saharan Africa remain under 19, in contrast to Europe and East Asia, where the share of people aged 65 and above continues rising sharply.

This divergence is reshaping global migration and labour patterns, with ageing economies increasingly dependent on migrant workers to sustain growth. Russia itself now hosts nearly 3 million registered migrant workers, more than 80 per cent from Central Asia, underscoring how even declining powers rely on younger populations elsewhere.

A new axis of power

Taken together, these trends point to an emerging axis of global power built on demography as much as military or economic strength.

Young, large-population nations such as India and much of Africa are gaining structural advantages in growth and labour supply, while ageing powers—including China, Russia, Japan and much of Europe—face mounting pressure on militaries, pensions and productivity.

From the battlefields of Eastern Europe to the factories of East Asia and the expanding economies of South Asia and Africa, demographics are becoming a key determinant of global power.

On this World Population Day, population is no longer simply about numbers—it is increasingly about economics, security, resilience and the changing geopolitical order.