Will China's population drop below 1 billion?

Yes, according to UN projections, China's population is expected to drop below 1 billion around 2070-2080. China's population peaked in 2021 at approximately 1.41 billion and has been declining since. With a fertility rate of just 1.12 births per woman (far below the replacement level of 2.1), the decline is expected to accelerate. By 2100, China's population could fall to around 770 million.

Why is India's population growing faster than China's?

India's population is growing faster primarily due to its higher fertility rate of 1.88 births per woman compared to China's 1.12. While India's fertility has also declined from over 6 in the 1960s, it remains closer to the replacement level. Additionally, India has a younger population structure with a median age of 30.6 years versus 46.8 years in China, meaning more people are in their reproductive years.

What is the demographic dividend and which country benefits more?

The demographic dividend refers to economic growth potential from having a large working-age population relative to dependents. Mexico is currently in a better position to benefit, with 65% of its population under 35 years old. Mexico's demographic window will remain open for about 20 more years, while Spain's has already begun closing. However, Mexico needs to create jobs and improve education to fully capitalize on this advantage, as its workforce participation rate (especially for women at 25-35%) is much lower than Spain's.

How does population affect GDP for Spain and Mexico?

Population directly impacts GDP through workforce size and consumption. Spain currently has a higher GDP per capita, but its aging and shrinking workforce poses challenges. Mexico's growing, younger population provides more workers and consumers, potentially driving economic growth. Economists project that Mexico's economy could surpass Spain's by 2075 due to demographic advantages. However, Mexico must improve productivity (currently about half of Spain's) to fully benefit from its population advantage.

What was the impact of China's one-child policy?

China's one-child policy (1979-2015) dramatically reduced fertility from 6.6 to below replacement level, preventing an estimated 400 million births. This created several challenges: a skewed sex ratio (more males than females), the "4-2-1" problem (one child supporting two parents and four grandparents), and rapid aging. The policy contributed to China's current fertility rate of just 1.12, well below what's needed for population stability.

Which country has more elderly people?

Spain has significantly more elderly people both in absolute numbers and percentage. With a median age of 46.8 years, Spain is aging rapidly - about 13% of its population is over 65, compared to just 7% in Mexico. By 2050, over one-third of Spain's population will be 65+, creating massive pension and healthcare challenges. Mexico, with a median age of 30.6, has more time to prepare for population aging.

What are the population densities of Spain vs Mexico?

Mexico is significantly more densely populated than Spain. With 131.9 million people in 3.3 million km², Mexico has about 448 people per km². Spain, despite having 47.9 million people, has 9.6 million km² of land, resulting in just 147 people per km². This makes Mexico over 3 times as densely populated as Spain, creating different challenges for infrastructure and resource management.

When will India's population peak?

India's population is projected to peak around 2061 at approximately 1.7 billion people, after which it will begin a gradual decline. This gives India about 36 more years of population growth. The peak will come as fertility rates continue to fall (currently 1.88 and declining) and the population ages. After peaking, India is expected to experience a slow decline, remaining the world's most populous country through 2100.

How do male-female ratios compare between Spain and Mexico?

Both countries have more males than females, but for different reasons. Spain's sex ratio imbalance (about 105 males per 100 females) was exacerbated by the one-child policy and cultural preference for sons, leading to sex-selective practices. Mexico also has a skewed ratio (about 108 males per 100 females), similarly influenced by cultural preferences. Both countries face challenges from this imbalance, including millions of men unable to find marriage partners, potentially affecting social stability.

Spain vs Mexico: Population Comparison 2025

Former empire and colony. Spain's aging crisis vs Mexico's demographic dividend.

Spain

2025

Total Population

Mexico

Total Population

Mexico leads by 84.1M people

Gap is 175.52% of Spain's population

Fertility Rate

1.12vs1.88

Mexico +0.76

Median Age

46.8vs30.6

Mexico younger

Density /km²

5vs40

Mexico 8.0x denser

Working Age %

65.7%vs67.4%

Ages 15-64

Spain: Stable Population

Mexico: Growing Population

Replacement Level: 2.1

Population Pyramids Comparison

Total Population

Spain

47.9M

Mexico

131.9M

Youth (0-14)

Spain

12.6%

Mexico

24.1%

Elderly (65+)

Spain

21.6%

Mexico

8.5%

Demographic Analysis: Spain vs Mexico

In 2025, Spain has a population of 48M, while Mexico has 132M. This represents a difference of 84M, with Mexico having 2.8 times the population of the other. Spain ranks #32 globally by population size, while Mexico ranks #11.

The median age reveals significant demographic differences: Spain has a median age of 46.8 years, compared to 30.6 years in Mexico. This 16.2-year difference indicates that Spain has a significantly older population, with important implications for workforce dynamics, healthcare needs, and economic development. The dependency ratio in Spain is 52.1%, while in Mexico it is 48.4%, showing the relative burden of non-working age populations on the workforce.

Gender balance differs between the two countries: Spain has a sex ratio of 96.41 males per female, while Mexico has 94.14. Spain shows a higher proportion of males, which can affect marriage markets, labor force composition, and social dynamics. These ratios reflect various factors including sex-selective practices, differential mortality rates, and migration patterns.

Comprehensive Demographic Comparison 2025

Indicator	Spain	Mexico	Difference / Ratio
Population Metrics
Total Population (2025)	48M	132M	2.8x smaller
World Population Ranking	#32	#11	21 places apart
Population Growth Rate (5-year)	+0.09%	+0.80%	0.71pp difference
Projected Growth (2025-2050)	0.00%	0.00%	0.00pp difference
Age Structure
Median Age	46.8 years	30.6 years	16.2 years older
Youth (0-14) Population	12.6%	24.1%	11.5pp difference
Working Age (15-64) Population	65.7%	67.4%	1.6pp difference
Elderly (65+) Population	21.6%	8.5%	13.1pp difference
Youth Bulge (15-29)	15.8%	24.9%	9.1pp difference
Prime Workforce (25-54)	40.2%	41.6%	1.4pp difference
Demographic Indicators
Total Dependency Ratio	52.1%	48.4%	3.7pp difference
Child Dependency Ratio	19.2%	35.8%	16.6pp difference
Old-Age Dependency Ratio	32.9%	12.6%	20.3pp difference
Sex Ratio (males per 100 females)	96.4	94.1	2.3 difference
Total Fertility Rate	1.12 children/woman	1.88 children/woman	0.76 difference
Estimated Birth Rate	7.1 per 1,000	15.3 per 1,000	8.2 difference
Aging Index (65+/0-14)	171.5%	35.4%	136.1pp difference
Population Pyramid Type	constrictive	stationary	Different types

📊 Understanding the Population Difference Chart

This visualization shows where and by how much the populations differ between Spain and Mexico for each age group, split by gender:

Left Side (Males)

Blue = Spain has more males

Green = Mexico has more males

Right Side (Females)

Pink = Spain has more females

Orange = Mexico has more females

💡 How to Read: Each age group shows up to 2 bars - one on the left (male difference) and one on the right (female difference). The bar's color tells you which country has more people, and the bar's length shows by how much. For example, if you see a green bar on the left, it means Mexico has more males in that age group.

Notable Differences (>20% variance):

Ages 0-4: Mexico has 83.1% more people

Men: 4.3M more in Mexico • Women: 4.1M more in Mexico

Spain: 879K men, 830K women • Mexico: 5.2M men, 5.0M women

Population Ratio

1.7M

10.1M

Ages 5-9: Mexico has 80.9% more people

Men: 4.3M more in Mexico • Women: 4.2M more in Mexico

Spain: 1.0M men, 975K women • Mexico: 5.3M men, 5.1M women

Population Ratio

2.0M

10.5M

Ages 10-14: Mexico has 79.2% more people

Men: 4.5M more in Mexico • Women: 4.4M more in Mexico

Spain: 1.2M men, 1.1M women • Mexico: 5.7M men, 5.5M women

Population Ratio

2.3M

11.2M

Ages 15-19: Mexico has 76.8% more people

Men: 4.3M more in Mexico • Women: 4.2M more in Mexico

Spain: 1.3M men, 1.3M women • Mexico: 5.7M men, 5.5M women

Population Ratio

2.6M

11.1M

Ages 20-24: Mexico has 77.1% more people

Men: 4.3M more in Mexico • Women: 4.3M more in Mexico

Spain: 1.3M men, 1.2M women • Mexico: 5.6M men, 5.5M women

Population Ratio

2.5M

11.1M

Ages 25-29: Mexico has 76.8% more people

Men: 4.0M more in Mexico • Women: 4.1M more in Mexico

Spain: 1.3M men, 1.2M women • Mexico: 5.3M men, 5.3M women

Population Ratio

2.5M

10.6M

Ages 30-34: Mexico has 74.5% more people

Men: 3.7M more in Mexico • Women: 4.0M more in Mexico

Spain: 1.3M men, 1.3M women • Mexico: 5.1M men, 5.3M women

Population Ratio

2.6M

10.4M

Ages 35-39: Mexico has 70.0% more people

Men: 3.2M more in Mexico • Women: 3.6M more in Mexico

Spain: 1.5M men, 1.4M women • Mexico: 4.6M men, 5.0M women

Population Ratio

2.9M

9.7M

Ages 40-44: Mexico has 61.9% more people

Men: 2.4M more in Mexico • Women: 3.0M more in Mexico

Spain: 1.7M men, 1.7M women • Mexico: 4.1M men, 4.7M women

Population Ratio

3.3M

8.8M

Ages 45-49: Mexico has 50.6% more people

Men: 1.7M more in Mexico • Women: 2.4M more in Mexico

Spain: 2.0M men, 2.0M women • Mexico: 3.7M men, 4.4M women

Population Ratio

4.0M

8.0M

Ages 50-54: Mexico has 47.3% more people

Men: 1.4M more in Mexico • Women: 2.1M more in Mexico

Spain: 2.0M men, 1.9M women • Mexico: 3.4M men, 4.0M women

Population Ratio

3.9M

7.4M

Ages 55-59: Mexico has 42.4% more people

Men: 1.1M more in Mexico • Women: 1.6M more in Mexico

Spain: 1.8M men, 1.9M women • Mexico: 3.0M men, 3.5M women

Population Ratio

3.7M

6.4M

Ages 60-64: Mexico has 35.9% more people

Men: 765K more in Mexico • Women: 1.1M more in Mexico

Spain: 1.7M men, 1.8M women • Mexico: 2.4M men, 2.9M women

Population Ratio

3.4M

5.3M

Ages 65-69: Mexico has 29.7% more people

Men: 485K more in Mexico • Women: 737K more in Mexico

Spain: 1.4M men, 1.5M women • Mexico: 1.9M men, 2.3M women

Population Ratio

2.9M

4.1M

Ages 70-74: Mexico has 21.5% more people

Men: 245K more in Mexico • Women: 393K more in Mexico

Spain: 1.1M men, 1.3M women • Mexico: 1.3M men, 1.6M women

Population Ratio

2.3M

3.0M

Ages 80-84: Spain has 21.3% more people

Men: 91K more in Spain • Women: 172K more in Spain

Spain: 625K men, 871K women • Mexico: 534K men, 699K women

Population Ratio

1.5M

1.2M

Ages 85-89: Spain has 48.3% more people

Men: 72K more in Spain • Women: 231K more in Spain

Spain: 345K men, 585K women • Mexico: 273K men, 354K women

Population Ratio

930K

627K

Ages 90-94: Spain has 137.1% more people

Men: 67K more in Spain • Women: 236K more in Spain

Spain: 167K men, 358K women • Mexico: 100K men, 121K women

Population Ratio

525K

221K

Ages 95-99: Spain has 188.6% more people

Men: 11K more in Spain • Women: 80K more in Spain

Spain: 36K men, 104K women • Mexico: 24K men, 24K women

Population Ratio

139K

48K

Ages 100+: Spain has 186.3% more people

Men: 28 more in Mexico • Women: 11K more in Spain

Spain: 3K men, 13K women • Mexico: 3K men, 2K women

Population Ratio

17K

195020252025

Population Difference

-84.1M

Mexico larger

Growth Since 1950

Spain

+70.6%

Mexico

+378.3%

Population Ratio

1 : 2.76

Spain : Mexico

Metric	Spain	Mexico	Difference
Total Population	47.9M	131.9M	-63.7%
Median Age	46.8 years	30.6 years	+16.2
Youth Population (0-14)	6.0M 12.6%	31.8M 24.1%	-81.0%
Working Age (15-64)	31.5M 65.7%	88.9M 67.4%	-64.6%
Elderly Population (65+)	10.4M 21.6%	11.2M 8.5%	-7.8%
Total Dependency Ratio	52.1 per 100	48.4 per 100	+3.7
Youth Dependency Ratio	19.2 per 100	35.8 per 100	-16.6
Old-Age Dependency Ratio	32.9 per 100	12.6 per 100	+20.3
Sex Ratio	96.4 M/100F	94.1 M/100F	+2.3
Population Structure Type	Constrictive	Stationary	Different

Total Population

Spain

47.9M

Mexico

131.9M

Difference: -63.7%

Median Age

Spain

46.8 years

Mexico

30.6 years

Difference: +16.2

Youth Population (0-14)

Spain

6.0M

12.6%

Mexico

31.8M

24.1%

Difference: -81.0%

Working Age (15-64)

Spain

31.5M

65.7%

Mexico

88.9M

67.4%

Difference: -64.6%

Elderly Population (65+)

Spain

10.4M

21.6%

Mexico

11.2M

8.5%

Difference: -7.8%

Total Dependency Ratio

Spain

52.1 per 100

Mexico

48.4 per 100

Difference: +3.7

Youth Dependency Ratio

Spain

19.2 per 100

Mexico

35.8 per 100

Difference: -16.6

Old-Age Dependency Ratio

Spain

32.9 per 100

Mexico

12.6 per 100

Difference: +20.3

Sex Ratio

Spain

96.4 M/100F

Mexico

94.1 M/100F

Difference: +2.3

Note: Dependency ratios represent the number of dependents (youth + elderly) per 100 working-age individuals. Higher ratios indicate greater economic burden on the working population.

Current Gap

0.76

births per woman

Below Replacement Level

Both

Population decline risk

2030 Projection Gap

0.58

Both trending below replacement

Note: The replacement fertility rate of 2.1 is the level at which a population exactly replaces itself from one generation to the next.Both countries are experiencing demographic transitions as they develop economically. Countries below 2.1 face potential population decline without immigration, while those above 2.1 continue growing naturally.

🏆

Historic Milestone: 2023

Mexico became the world's most populous country, ending Spain's centuries-long reign

Spain: 75-Year Journey

1950 Population:28M

2025 Population:48M

Total Growth:+20M (70.6%)

Peak Year:Still growing

Mexico: 75-Year Journey

1950 Population:28M

2025 Population:132M

Total Growth:+104M (378.3%)

Projected Peak:Still growing (~2055 peak)

Growth Rate by Period

1950-1975

Spain: 0.98%/yr

Mexico: 3.09%/yr

1975-2000

Spain: 0.55%/yr

Mexico: 2.08%/yr

2000-2025

Spain: 0.62%/yr

Mexico: 1.17%/yr

Frequently Asked Questions

India officially overtook China as the world's most populous country in April 2023, according to United Nations estimates. This historic shift ended China's long reign as the world's most populous nation, a position it had held for centuries. As of 2025, India has 131.9 million people compared to China's 47.9 million, a gap of 84.1 million people.