Compare · UN World Population Prospects 2024

Tanzania and United Kingdom, side by side

In 2026, half of the people in Tanzania are older than 19. In the United Kingdom, half are older than 41.

UN estimates for mid-2023: Tanzania 66,617,606 people · United Kingdom 68,682,962

Tanzania 72.6 million people Half are older than 19 3 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

TZA × 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.

Tanzania

Children, under 15: 42
Aged 15 to 64: 55
Aged 65 and over: 3

United Kingdom

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

TZA × GBR · families and lifetimes

Children, and how long lives last

Tanzania is at about 4.4 children for each woman, at this year's rates; the United Kingdom is at about 1.5. Around 2.1 children per woman keeps a population the same size over time, leaving migration aside. Life expectancy at birth this year: about 68 years in Tanzania, about 82 in the United Kingdom.

Children per woman, 2026

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

Tanzania 4.4

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.

Tanzania 68 years

United Kingdom 82 years

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

TZA × GBR · 1950–2100 · how many

How big, and where they are heading

Tanzania is the larger of the two, with about as many people as the United Kingdom: 72.6 million to 69.9 million.

Tanzania's population is 9.5 times what it was in 1950; the United Kingdom's population is 1.4 times what it was in 1950.

Tanzania's population is still growing in 2100; the United Kingdom's population is expected to peak in 2072. In 2100: 263 million in Tanzania, 74.3 million in the United Kingdom (UN projection, medium).

Show the numbers

Year	Tanzania: people	United Kingdom: people	Tanzania: half older than	United Kingdom: half older than	Tanzania: children per woman	United Kingdom: children per woman	Tanzania: life expectancy	United Kingdom: life expectancy
1950	7.62516 million	50.1210 million	17.0	34.9	6.18	2.22	41.0	68.6
1960	9.90142 million	52.5386 million	17.3	35.5	6.54	2.70	42.6	71.0
1970	13.4927 million	55.6638 million	17.0	34.2	7.00	2.42	46.5	71.9
1980	19.1898 million	56.2821 million	16.4	34.3	6.99	1.89	51.3	73.6
1990	26.1102 million	57.3679 million	16.5	35.9	6.20	1.83	52.0	75.7
2000	34.2601 million	59.0573 million	17.4	37.6	5.67	1.64	53.2	77.8
2010	44.7585 million	63.0065 million	17.1	39.2	5.22	1.92	61.1	80.4
2023	66.6176 million	68.6830 million	18.2	40.8	4.61	1.56	67.0	81.3
2030*	80.9131 million	71.2870 million	19.1	41.7	4.16	1.52	68.4	82.4
2040*	103.999 million	73.7746 million	20.8	43.1	3.63	1.53	70.3	83.8
2050*	129.621 million	75.5047 million	22.8	43.9	3.23	1.55	71.8	85.1
2060*	156.851 million	76.0104 million	24.8	45.7	2.94	1.56	73.4	86.3
2070*	184.886 million	76.0491 million	26.9	46.9	2.72	1.57	74.8	87.4
2080*	212.537 million	75.9562 million	29.0	47.4	2.53	1.58	76.3	88.5
2090*	238.810 million	75.3783 million	31.2	48.0	2.39	1.59	77.8	89.5
2100*	262.835 million	74.3054 million	33.3	48.9	2.26	1.59	79.2	90.6

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

TZA − 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 Tanzania 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; Tanzania 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: Tanzania · 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.

250 comparisons have a page of their own; any other two places can be compared from the boxes at the top.

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

Verified 2026-09-30 · 73 canaries