Compare · UN World Population Prospects 2024

Thailand and United Kingdom, side by side

In 2026, half of the people in Thailand are older than 42. In the United Kingdom, half are older than 41.

UN estimates for mid-2023: Thailand 71,702,435 people · United Kingdom 68,682,962

Thailand 71.6 million people Half are older than 42 17 in 100 are 65 or older

United Kingdom 69.9 million people Half are older than 41 20 in 100 are 65 or older

How to read this: each pyramid stacks a place’s people by age — babies at the bottom, the oldest at the top, men on the left and women on the right. A wide bottom means many children; a wide top means many older people.

Compare shapes Compare sizes

Each bar is a share of its own place’s people, so a small country and a large one can be read side by side.

Year 2026 · UN projection

estimatesprojections

men women projected

Verified 2026-09-30 · 73 canaries

THA × GBR · 2026 · age groups

If each place were 100 people

Shrink each population to 100 people and count them. Dots are children under 15, filled squares are people aged 15 to 64, and open squares are people 65 and over. The picture follows the year slider above.

Thailand

Children, under 15: 14
Aged 15 to 64: 69
Aged 65 and over: 17

United Kingdom

Children, under 15: 17
Aged 15 to 64: 63
Aged 65 and over: 20

THA × GBR · families and lifetimes

Children, and how long lives last

If the birth rates of this year held for a whole lifetime, a woman in Thailand would have about 1.2 children and a woman in the United Kingdom about 1.5. A baby born in Thailand this year can expect to live about 77 years. In the United Kingdom, about 82.

Children per woman, 2026

Each figure is one child: how many children a woman would have in her lifetime at that year’s rates.

Thailand 1.2

United Kingdom 1.5

The dashed line at 2.1 is about what it takes for each generation to replace the one before it, leaving migration aside.

How long a newborn can expect to live, 2026

Each block is ten years of life, if the death rates of that year stayed the same all life long.

Thailand 77 years

United Kingdom 82 years

Hatched marks are UN projections (medium variant), not measurements.

THA × GBR · 1950–2100 · how many

How big, and where they are heading

Thailand is the larger of the two, with about as many people as the United Kingdom: 71.6 million to 69.9 million.

Set each against its own 1950 self and Thailand's population is 3.5 times what it was in 1950, the United Kingdom's population is 1.4 times what it was in 1950.

Thailand's population peaked in 2022; the United Kingdom's population is expected to peak in 2072. The UN expects the United Kingdom to have more people than Thailand from 2030. In 2100: 45.6 million in Thailand, 74.3 million in the United Kingdom (UN projection, medium).

Show the numbers

Year	Thailand: people	United Kingdom: people	Thailand: half older than	United Kingdom: half older than	Thailand: children per woman	United Kingdom: children per woman	Thailand: life expectancy	United Kingdom: life expectancy
1950	20.4284 million	50.1210 million	18.5	34.9	6.36	2.22	45.2	68.6
1960	26.8517 million	52.5386 million	17.9	35.5	6.33	2.70	50.6	71.0
1970	35.9544 million	55.6638 million	17.3	34.2	5.45	2.42	56.5	71.9
1980	45.6500 million	56.2821 million	19.9	34.3	3.29	1.89	62.2	73.6
1990	54.7383 million	57.3679 million	24.2	35.9	2.06	1.83	68.9	75.7
2000	63.0078 million	59.0573 million	30.0	37.6	1.73	1.64	71.2	77.8
2010	68.5794 million	63.0065 million	34.5	39.2	1.56	1.92	75.0	80.4
2023	71.7024 million	68.6830 million	40.7	40.8	1.21	1.56	76.4	81.3
2030*	71.2150 million	71.2870 million	43.6	41.7	1.20	1.52	77.9	82.4
2040*	69.5350 million	73.7746 million	47.0	43.1	1.25	1.53	79.9	83.8
2050*	66.3827 million	75.5047 million	49.6	43.9	1.29	1.55	81.7	85.1
2060*	61.9770 million	76.0104 million	51.5	45.7	1.33	1.56	83.3	86.3
2070*	57.4162 million	76.0491 million	53.0	46.9	1.37	1.57	84.7	87.4
2080*	53.1630 million	75.9562 million	53.0	47.4	1.40	1.58	86.0	88.5
2090*	49.1948 million	75.3783 million	52.9	48.0	1.42	1.59	87.2	89.5
2100*	45.5551 million	74.3054 million	52.9	48.9	1.44	1.59	88.4	90.6

* UN projection, medium variant. People at mid-year; ages and life expectancy in years.

THA − GBR · 1950–2100 · every age

Which ages each place has more of

Each column is a year and each row an age, from babies at the bottom to 100 at the top. The shade of a cell shows which place has more of its people at that age — the key beside the picture tells you which shade is Thailand and which is the United Kingdom, and the in-between shade means the same. Because it compares shares, a small place and a large one can be compared fairly.

236 countries · 1950–2100

Where they sit among all countries

Every country in the world, every year from 1950 to 2100. The grey cloud shows where most countries are; Thailand is drawn in solid blue squares and the United Kingdom in open orange squares, so you can see whether each is ahead of the crowd, behind it or in the middle.

More comparisons

Keep exploring

Each place on its own: Thailand · United Kingdom. Or pick any two places with the boxes at the top of this page.

Other comparisons

Apparatus

Sources and method

Both sides of this comparison come from the UN Population Division's World Population Prospects 2024 — the same release, the same tables, counted to 2023 and projected beyond it on the medium variant. That shared origin is what a comparison rests on.

How the median age and the “100 people” pictures are worked out, and why the pictures of every country leave the regions out: how the figures here are put together.

This is one of 250 pairs with a page. The boxes at the top will take any other two places you want to see side by side.

Sources: UN WPP 2024 · flag-icons. Every source, its licence and how to cite it →

Verified 2026-09-30 · 73 canaries