Africa’s under-15 population: 16 of every 100 people aged 0–14 across 54 African countries lived in Nigeria in 2025

Key Takeaways

  • Nigeria had 96.25 million children aged 0–14 in 2025, the largest child population in Africa.
  • 16% of Africa’s children lived in Nigeria, or roughly 1 in every 6.
  • Ethiopia and DR Congo followed with 52.54 million and 51.85 million children respectively.
  • Africa’s 10 largest child populations accounted for 60.9% of the continent’s 600.17 million children.

As of 2025, Nigeria was home to 96.25 million children aged 0–14. That means 16 of every 100 children across 54 African countries lived in Nigeria that year.

Ethiopia and DR Congo followed, with 52.54 million and 51.85 million respectively. Together, Africa's ten most populous countries for this age group, Nigeria, Ethiopia, DR Congo, Egypt, Tanzania, Uganda, Kenya, Sudan, Angola and South Africa, accounted for 60.91% of the continent's 600.17 million children.

Source:

World Bank; UN World Population Prospects

Period:

2025
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Africa’s under-15 population: nearly half the population of the Central African Republic is under 15
  • Central African Republic had Africa’s highest 0–14 population share at 48.7%.
  • Somalia, Niger, Chad and DR Congo followed, all with at least 45.9% of their populations aged 0–14.
  • DR Congo had Africa’s largest 0–14 population at 51.85 million, despite ranking fifth by share.
  • Children aged 0–14 made up 38.8% of Africa’s population, versus 40.5% in Nigeria.

Twelve African countries have gone at least a decade without completing a new population census
  • Twelve African countries have not completed a census in at least 10 years.
  • DR Congo (42 years) and Somalia (40 years) have Africa's oldest censuses.
  • Guinea-Bissau has completed a new census, while Cameroon and Chad are still counting.
  • Nigeria and DR Congo are preparing new censuses, but fieldwork has not begun.
  • South Sudan's census is disputed, while Eritrea is excluded from the ranking.

Mauritius has almost as many elderly people as children: 97 for every 100
  • Mauritius had 97 elderly people per 100 children in 2025, over 11 times Africa’s median of 8.5.
  • Its ratio increased from fewer than seven in 1960 to 24 in 2000, becoming Africa’s highest in 2009.
  • Seychelles ranked second with 44 elderly people per 100 children, followed by Tunisia with 42.
  • Mauritius’s child share fell from 25.6% to 14.5% between 2000 and 2025, while its elderly share increased from 6.1% to 14.1%.
  • Nigeria’s ratio moved from 6.9 to 7.6 between 2000 and 2025, placing it 38th among 54 countries.

Lagos, Kano, Abuja, and Ibadan are among Africa’s most populous cities with a combined population of 31.3 mn
  • Lagos is Africa’s third-largest city and ranks 14th globally.
  • Cairo remains Africa’s largest city, with over 23 million people, keeping Egypt at the centre of the continent’s urban network.
  • Kinshasa’s position shows Central Africa’s rising urban influence.
  • There is a steep population gap after the top three cities.

3 African cities feature in the 20 most populous cities globally, with a total population of 59.9 million
  • Together, the top three cities — Tokyo, Delhi, and Shanghai — have more than 100 million residents.
  • Asia dominates the ranking, with most of the top ten cities located on the continent.
  • Only three African cities — Cairo, Kinshasa, and Lagos — appear in the top 20.
  • Africa’s three mega-cities together account for nearly 60 million people, showing concentrated urban growth.
  • Urban population growth is driven by migration toward economic and commercial hubs.

Nigeria's age dependency ratio for the young dominates that of the old, on average, at 14:1
  • The young-to-old dependency ratio stands at 14:1, showing that youth dependency overwhelmingly drives the total ratio.
  • The total dependency ratio declined from 88.2% in 1976 to 78.8% in 2024, showing slow but steady improvement.
  • The youth dependency ratio has dropped from 82.2% to 73.3% over the same period.
  • The old-age dependency ratio remained almost flat, averaging around 5–6% for nearly 50 years.
  • The highest total dependency ratio was 95.0% in 1988.
  • The ratio’s slight downward trend after 2012 reflects a growing working-age population entering the labour market.

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