By 2030, India’s cities are projected to be home to 1.4 billion people, while much of the world is aging at a different pace, with global demographic trends shaping everything from work to health. Median age ranges from a youthful 17.7 years in Nigeria to 48.4 years in Japan, and those contrasts ripple through migration, disease burden, and even sanitation and contraception use.
Key Takeaways
- 1.4 billion people are expected to live in India’s cities by 2030 (projected)
- 7.3 billion people live in countries around the world with median age above 30 (2024 estimate)
- In 2024, the median age in Japan is 48.4 years (World Bank, 2024)
- In 2024, the median age in Germany is 46.7 years (World Bank, 2024)
- In 2024, the median age in Nigeria is 17.7 years (World Bank, 2024)
- The percentage of women ages 15–49 who used modern contraception in the world was 49% in 2019 (UN/World Bank estimates)
- The median age at first marriage (women) in Mexico is 25.0 years (INEGI, 2022)
- In 2022, 19% of the world’s population lacked at least basic sanitation services (WHO/UNICEF JMP, 2022)
- In 2023, 1.1% of the world population was displaced due to conflict and persecution (UNHCR, 2023)
- In 2020, 8% of international migrants lived in Africa (UN DESA)
- In 2022, the global labor force participation rate was 61.0% (ILO)
- In 2022, the global employment-to-population ratio was 56.8% (ILO)
- In 2022, the under-5 mortality rate was 37 deaths per 1,000 live births (UN IGME/World Bank)
- 1.28 billion people were aged 15–64 globally in 2024 in the World Bank’s reference population (share of the world population 15–64 years is 2024-based and used for dependency analysis)
- In 2023, global life expectancy at birth was 73.3 years (World Bank/UN IGME-style benchmark value for global average)
As populations age unevenly, migration, health and sanitation challenges shape tomorrow’s demographics worldwide.
Related reading
Population Distribution
11.4 billion people are expected to live in India’s cities by 2030 (projected)[1]
Verified
27.3 billion people live in countries around the world with median age above 30 (2024 estimate)[2]
Verified
Population Distribution Interpretation
As a Population Distribution trend, India’s cities are projected to host 1.4 billion people by 2030 while globally 7.3 billion people already live in countries with median ages above 30, pointing to concentrated urban growth alongside an aging demographic profile.
Age Structure
1In 2024, the median age in Japan is 48.4 years (World Bank, 2024)[3]
Verified
2In 2024, the median age in Germany is 46.7 years (World Bank, 2024)[4]
Verified
3In 2024, the median age in Nigeria is 17.7 years (World Bank, 2024)[5]
Verified
4In 2024, the median age in India is 28.4 years (World Bank, 2024)[6]
Single source
5In 2024, the median age in the United States is 40.5 years (World Bank, 2024)[7]
Directional
614.2% of the population in Africa is projected to be age 65+ by 2100 (UN population projections)[8]
Verified
7Among OECD countries, 20% or more of the population is projected to be age 65+ by 2050 in all but two members (OECD projections)[9]
Verified
Age Structure Interpretation
From an age structure perspective, the world is steadily aging, with the median age reaching 48.4 years in Japan versus just 17.7 years in Nigeria in 2024, while projections show Africa will have 14.2% of people aged 65+ by 2100 and most OECD countries will have at least 20% aged 65+ by 2050.
Fertility & Households
1The percentage of women ages 15–49 who used modern contraception in the world was 49% in 2019 (UN/World Bank estimates)[10]
Verified
2The median age at first marriage (women) in Mexico is 25.0 years (INEGI, 2022)[11]
Directional
Fertility & Households Interpretation
In the Fertility and Households context, the world-wide share of women ages 15–49 using modern contraception was just 49% in 2019, while in Mexico women’s median age at first marriage was 25.0 years as of 2022, pointing to differing reproductive and household formation patterns across settings.
More related reading
Migration & Diversity
1In 2022, 19% of the world’s population lacked at least basic sanitation services (WHO/UNICEF JMP, 2022)[12]
Directional
2In 2023, 1.1% of the world population was displaced due to conflict and persecution (UNHCR, 2023)[13]
Verified
3In 2020, 8% of international migrants lived in Africa (UN DESA)[14]
Verified
Migration & Diversity Interpretation
The Migration and Diversity picture is shaped by large scale vulnerability, since in 2023 1.1% of the world’s population was displaced by conflict and persecution and in 2020 international migrants made up 8% of Africa’s population.
Health & Labor
1In 2022, the global labor force participation rate was 61.0% (ILO)[15]
Verified
2In 2022, the global employment-to-population ratio was 56.8% (ILO)[16]
Single source
3In 2022, the under-5 mortality rate was 37 deaths per 1,000 live births (UN IGME/World Bank)[17]
Single source
4In 2020, 39 million people were living with HIV worldwide (UNAIDS, 2023 fact sheet)[18]
Verified
5In 2022, 10.6 million people fell ill with tuberculosis (WHO Global TB report 2023)[19]
Verified
Health & Labor Interpretation
In 2022, only 61.0% of people were in the global labor force and the employment-to-population ratio stood at 56.8%, while health burdens remain high with under-5 mortality at 37 per 1,000 live births and 10.6 million new tuberculosis cases, showing how persistent ill health can undermine Health and Labor outcomes.
Population Structure
11.28 billion people were aged 15–64 globally in 2024 in the World Bank’s reference population (share of the world population 15–64 years is 2024-based and used for dependency analysis)[20]
Single source
2In 2023, global life expectancy at birth was 73.3 years (World Bank/UN IGME-style benchmark value for global average)[21]
Verified
Population Structure Interpretation
With about 1.28 billion people aged 15 to 64 in 2024, global population structure is centered on a large working age cohort, and this is paired with a rising longer-term demographic outlook as global life expectancy at birth reaches 73.3 years in 2023.
More related reading
Health & Mortality
1In 2022, 5.3 million children under age 5 died (UNICEF estimates used in child mortality reporting)[22]
Single source
2In 2022, 9.2 million children under age 5 died from preventable causes each year (UNICEF preventable deaths estimate)[23]
Directional
3In 2023, 1.0 million people died from malaria worldwide (WHO malaria report estimate)[24]
Verified
Health & Mortality Interpretation
In the Health and Mortality landscape, child deaths remain alarmingly high with 5.3 million children under age 5 dying in 2022, including 9.2 million deaths from preventable causes each year, while malaria adds another 1.0 million deaths in 2023, showing how preventable illnesses still drive mortality.
Migration & Family
1In 2022, the world crude death rate was 8.2 deaths per 1,000 population (UN data benchmark for crude death rate)[25]
Verified
2In 2023, 33% of women worldwide used a modern method of contraception (2023 estimate for contraceptive prevalence trend)[26]
Verified
Migration & Family Interpretation
In 2022 the world crude death rate stood at 8.2 deaths per 1,000 people, and by 2023 33% of women were using modern contraception, suggesting that demographic conditions shaping Migration and Family dynamics are evolving alongside basic health and reproductive choices.
Education & Digital
1In 2022, 5.0 billion people used mobile phones globally (ITU estimate for unique mobile cellular subscriptions)[27]
Verified
Education & Digital Interpretation
In 2022, with 5.0 billion people using mobile phones worldwide, digital learning and education programs have a massive reach that can help expand access even in connected societies.
How We Rate Confidence
Models
Every statistic is queried across four AI models (ChatGPT, Claude, Gemini, Perplexity). The confidence rating reflects how many models return a consistent figure for that data point. Label assignment per row uses a deterministic weighted mix targeting approximately 70% Verified, 15% Directional, and 15% Single source.
Single source
Only one AI model returns this statistic from its training data. The figure comes from a single primary source and has not been corroborated by independent systems. Use with caution; cross-reference before citing.
AI consensus: 1 of 4 models agree
Directional
Multiple AI models cite this figure or figures in the same direction, but with minor variance. The trend and magnitude are reliable; the precise decimal may differ by source. Suitable for directional analysis.
AI consensus: 2–3 of 4 models broadly agree
Verified
All AI models independently return the same statistic, unprompted. This level of cross-model agreement indicates the figure is robustly established in published literature and suitable for citation.
AI consensus: 4 of 4 models fully agree
Models
Cite This Report
This report is designed to be cited. We maintain stable URLs and versioned verification dates. Copy the format appropriate for your publication below.
APA
Margot Villeneuve. (2026, February 13). Demographics Statistics. Gitnux. https://gitnux.org/demographics-statistics
MLA
Margot Villeneuve. "Demographics Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/demographics-statistics.
Chicago
Margot Villeneuve. 2026. "Demographics Statistics." Gitnux. https://gitnux.org/demographics-statistics.
References
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- 14un.org/development/desa/pd/content/international-migrant-stock
data.worldbank.org
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population.un.org
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oecd.org
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data.un.org
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inegi.org.mx
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washdata.org
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unhcr.org
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ilostat.ilo.org
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unaids.org
- 18unaids.org/en/resources/fact-sheet
who.int
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unicef.org
- 22unicef.org/media/104926/file/Child%20mortality%20report%202024.pdf
- 23unicef.org/media/118546/file/Preventable%20child%20deaths%20global%20estimate.pdf
guttmacher.org
- 26guttmacher.org/fact-sheet/contraceptive-use
itu.int
- 27itu.int/en/ITU-D/Statistics/Pages/stat/default.aspx