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 1.21 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 1.91 births per woman compared to China's 1.21. 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 34.4 years versus 41.5 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. Vietnam is currently in a better position to benefit, with 65% of its population under 35 years old. Vietnam's demographic window will remain open for about 20 more years, while Thailand's has already begun closing. However, Vietnam 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 Thailand's.

How does population affect GDP for Thailand and Vietnam?

Population directly impacts GDP through workforce size and consumption. Thailand currently has a higher GDP per capita, but its aging and shrinking workforce poses challenges. Vietnam's growing, younger population provides more workers and consumers, potentially driving economic growth. Economists project that Vietnam's economy could surpass Thailand's by 2075 due to demographic advantages. However, Vietnam must improve productivity (currently about half of Thailand'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 1.21, well below what's needed for population stability.

Which country has more elderly people?

Thailand has significantly more elderly people both in absolute numbers and percentage. With a median age of 41.5 years, Thailand is aging rapidly - about 13% of its population is over 65, compared to just 7% in Vietnam. By 2050, over one-third of Thailand's population will be 65+, creating massive pension and healthcare challenges. Vietnam, with a median age of 34.4, has more time to prepare for population aging.

What are the population densities of Thailand vs Vietnam?

Vietnam is significantly more densely populated than Thailand. With 101.6 million people in 3.3 million km², Vietnam has about 448 people per km². Thailand, despite having 71.6 million people, has 9.6 million km² of land, resulting in just 147 people per km². This makes Vietnam over 3 times as densely populated as Thailand, 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 1.91 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 Thailand and Vietnam?

Both countries have more males than females, but for different reasons. Thailand'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. Vietnam 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.

Thailand vs Vietnam: Population Comparison 2025

Southeast Asian development models. Thailand's aging society vs Vietnam's demographic dividend.

Thailand

2025

Total Population

Vietnam

Total Population

Vietnam leads by 30.0M people

Gap is 41.86% of Thailand's population

Fertility Rate

1.21vs1.91

Vietnam +0.70

Median Age

41.5vs34.4

Vietnam younger

Density /km²

7vs31

Vietnam 4.4x denser

Working Age %

69.6%vs67.6%

Ages 15-64

Thailand: Stable Population

Vietnam: Stable Population

Replacement Level: 2.1

Population Pyramids Comparison

Total Population

Thailand

71.6M

Vietnam

101.6M

Youth (0-14)

Thailand

14.4%

Vietnam

22.9%

Elderly (65+)

Thailand

16.0%

Vietnam

9.5%

Demographic Analysis: Thailand vs Vietnam

In 2025, Thailand has a population of 72M, while Vietnam has 102M. This represents a difference of 30M, with Vietnam having 1.4 times the population of the other. Thailand ranks #20 globally by population size, while Vietnam ranks #16.

The median age reveals significant demographic differences: Thailand has a median age of 41.5 years, compared to 34.4 years in Vietnam. This 7.1-year difference indicates that Thailand has a significantly older population, with important implications for workforce dynamics, healthcare needs, and economic development. The dependency ratio in Thailand is 43.7%, while in Vietnam it is 47.8%, showing the relative burden of non-working age populations on the workforce.

Gender balance differs between the two countries: Thailand has a sex ratio of 94.71 males per female, while Vietnam has 95.98. Vietnam 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	Thailand	Vietnam	Difference / Ratio
Population Metrics
Total Population (2025)	72M	102M	1.4x smaller
World Population Ranking	#20	#16	4 places apart
Population Growth Rate (5-year)	-0.01%	+0.71%	0.71pp difference
Projected Growth (2025-2050)	0.00%	0.00%	0.00pp difference
Age Structure
Median Age	41.5 years	34.4 years	7.1 years older
Youth (0-14) Population	14.4%	22.9%	8.4pp difference
Working Age (15-64) Population	69.6%	67.6%	1.9pp difference
Elderly (65+) Population	16.0%	9.5%	6.5pp difference
Youth Bulge (15-29)	19.4%	20.1%	0.8pp difference
Prime Workforce (25-54)	43.0%	43.4%	0.4pp difference
Demographic Indicators
Total Dependency Ratio	43.7%	47.8%	4.1pp difference
Child Dependency Ratio	20.7%	33.8%	13.1pp difference
Old-Age Dependency Ratio	23.0%	14.0%	9.0pp difference
Sex Ratio (males per 100 females)	94.7	96.0	1.3 difference
Total Fertility Rate	1.21 children/woman	1.91 children/woman	0.70 difference
Estimated Birth Rate	8.3 per 1,000	13.6 per 1,000	5.3 difference
Aging Index (65+/0-14)	111.1%	41.5%	69.6pp 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 Thailand and Vietnam for each age group, split by gender:

Left Side (Males)

Blue = Thailand has more males

Green = Vietnam has more males

Right Side (Females)

Pink = Thailand has more females

Orange = Vietnam 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 Vietnam has more males in that age group.

Notable Differences (>20% variance):

Ages 0-4: Vietnam has 56.9% more people

Men: 2.1M more in Vietnam • Women: 1.8M more in Vietnam

Thailand: 1.5M men, 1.4M women • Vietnam: 3.6M men, 3.3M women

Population Ratio

3.0M

6.9M

Ages 5-9: Vietnam has 55.5% more people

Men: 2.2M more in Vietnam • Women: 2.0M more in Vietnam

Thailand: 1.7M men, 1.6M women • Vietnam: 3.9M men, 3.7M women

Population Ratio

3.4M

7.6M

Ages 10-14: Vietnam has 54.4% more people

Men: 2.4M more in Vietnam • Women: 2.3M more in Vietnam

Thailand: 2.0M men, 1.9M women • Vietnam: 4.4M men, 4.3M women

Population Ratio

4.0M

8.7M

Ages 15-19: Vietnam has 43.0% more people

Men: 1.6M more in Vietnam • Women: 1.6M more in Vietnam

Thailand: 2.2M men, 2.1M women • Vietnam: 3.8M men, 3.7M women

Population Ratio

4.2M

7.5M

Ages 20-24: Vietnam has 28.7% more people

Men: 895K more in Vietnam • Women: 981K more in Vietnam

Thailand: 2.4M men, 2.3M women • Vietnam: 3.3M men, 3.3M women

Population Ratio

4.7M

6.5M

Ages 25-29: Vietnam has 23.3% more people

Men: 711K more in Vietnam • Women: 797K more in Vietnam

Thailand: 2.5M men, 2.4M women • Vietnam: 3.2M men, 3.2M women

Population Ratio

5.0M

6.5M

Ages 30-34: Vietnam has 37.9% more people

Men: 1.5M more in Vietnam • Women: 1.6M more in Vietnam

Thailand: 2.5M men, 2.5M women • Vietnam: 4.1M men, 4.1M women

Population Ratio

5.1M

8.2M

Ages 35-39: Vietnam has 42.1% more people

Men: 1.8M more in Vietnam • Women: 1.8M more in Vietnam

Thailand: 2.5M men, 2.5M women • Vietnam: 4.3M men, 4.3M women

Population Ratio

5.0M

8.6M

Ages 40-44: Vietnam has 34.8% more people

Men: 1.4M more in Vietnam • Women: 1.4M more in Vietnam

Thailand: 2.6M men, 2.6M women • Vietnam: 4.0M men, 4.0M women

Population Ratio

5.2M

8.0M

Ages 45-49: Vietnam has 22.0% more people

Men: 758K more in Vietnam • Women: 726K more in Vietnam

Thailand: 2.6M men, 2.7M women • Vietnam: 3.3M men, 3.4M women

Population Ratio

5.3M

6.7M

Ages 75-79: Thailand has 33.0% more people

Men: 296K more in Thailand • Women: 210K more in Thailand

Thailand: 870K men, 1.2M women • Vietnam: 574K men, 956K women

Population Ratio

2.0M

1.5M

Ages 80-84: Thailand has 51.7% more people

Men: 237K more in Thailand • Women: 182K more in Thailand

Thailand: 498K men, 733K women • Vietnam: 260K men, 551K women

Population Ratio

1.2M

811K

Ages 85-89: Thailand has 58.5% more people

Men: 159K more in Thailand • Women: 115K more in Thailand

Thailand: 281K men, 463K women • Vietnam: 122K men, 348K women

Population Ratio

744K

469K

Ages 90-94: Thailand has 58.5% more people

Men: 78K more in Thailand • Women: 45K more in Thailand

Thailand: 117K men, 216K women • Vietnam: 39K men, 171K women

Population Ratio

334K

210K

Ages 95-99: Thailand has 87.8% more people

Men: 26K more in Thailand • Women: 18K more in Thailand

Thailand: 32K men, 63K women • Vietnam: 5K men, 45K women

Population Ratio

95K

50K

Ages 100+: Thailand has 108.1% more people

Men: 5K more in Thailand • Women: 3K more in Thailand

Thailand: 5K men, 11K women • Vietnam: 382 men, 7K women

Population Ratio

16K

195020252025

Population Difference

-30.0M

Vietnam larger

Growth Since 1950

Thailand

+250.6%

Vietnam

+304.8%

Population Ratio

1 : 1.42

Thailand : Vietnam

Metric	Thailand	Vietnam	Difference
Total Population	71.6M	101.6M	-29.5%
Median Age	41.5 years	34.4 years	+7.1
Youth Population (0-14)	10.3M 14.4%	23.2M 22.9%	-55.5%
Working Age (15-64)	49.8M 69.6%	68.7M 67.6%	-27.5%
Elderly Population (65+)	11.5M 16.0%	9.6M 9.5%	+18.9%
Total Dependency Ratio	43.7 per 100	47.8 per 100	-4.1
Youth Dependency Ratio	20.7 per 100	33.8 per 100	-13.1
Old-Age Dependency Ratio	23.0 per 100	14.0 per 100	+9.0
Sex Ratio	94.7 M/100F	96.0 M/100F	-1.3
Population Structure Type	Constrictive	Stationary	Different

Total Population

Thailand

71.6M

Vietnam

101.6M

Difference: -29.5%

Median Age

Thailand

41.5 years

Vietnam

34.4 years

Difference: +7.1

Youth Population (0-14)

Thailand

10.3M

14.4%

Vietnam

23.2M

22.9%

Difference: -55.5%

Working Age (15-64)

Thailand

49.8M

69.6%

Vietnam

68.7M

67.6%

Difference: -27.5%

Elderly Population (65+)

Thailand

11.5M

16.0%

Vietnam

9.6M

9.5%

Difference: +18.9%

Total Dependency Ratio

Thailand

43.7 per 100

Vietnam

47.8 per 100

Difference: -4.1

Youth Dependency Ratio

Thailand

20.7 per 100

Vietnam

33.8 per 100

Difference: -13.1

Old-Age Dependency Ratio

Thailand

23.0 per 100

Vietnam

14.0 per 100

Difference: +9.0

Sex Ratio

Thailand

94.7 M/100F

Vietnam

96.0 M/100F

Difference: -1.3

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

0.70

births per woman

Below Replacement Level

Both

Population decline risk

2030 Projection Gap

0.61

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

Vietnam became the world's most populous country, ending Thailand's centuries-long reign

Thailand: 75-Year Journey

1950 Population:20M

2025 Population:72M

Total Growth:+51M (250.6%)

Peak Year:Still growing

Vietnam: 75-Year Journey

1950 Population:25M

2025 Population:102M

Total Growth:+76M (304.8%)

Projected Peak:Still growing

Growth Rate by Period

1950-1975

Thailand: 2.82%/yr

Vietnam: 2.50%/yr

1975-2000

Thailand: 1.74%/yr

Vietnam: 2.05%/yr

2000-2025

Thailand: 0.51%/yr

Vietnam: 1.11%/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 101.6 million people compared to China's 71.6 million, a gap of 30.0 million people.