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Compare · UN World Population Prospects 2024
Iran and 
Tanzania, side by side
Line both places up by age in 2026. In Iran, half are older than 36; in Tanzania, half are older than 19.
UN estimates for mid-2023: Iran 90,608,707 people · Tanzania 66,617,606
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.
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.
men women projected
IRN × TZA · 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.
- Children, under 15
- 22
- Aged 15 to 64
- 69
- Aged 65 and over
- 9
- Children, under 15
- 42
- Aged 15 to 64
- 55
- Aged 65 and over
- 3
IRN × TZA · families and lifetimes
Children, and how long lives last
If the birth rates of this year held for a whole lifetime, a woman in Iran would have about 1.7 children and a woman in Tanzania about 4.4. Around 2.1 children per woman keeps a population the same size over time, leaving migration aside. Babies born this year can expect about 78 years of life in Iran and about 68 in Tanzania.
Children per woman, 2026
Each figure is one child: how many children a woman would have in her lifetime at that year’s rates.
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.
Hatched marks are UN projections (medium variant), not measurements.
IRN × TZA · 1950–2100 · how many
How big, and where they are heading
There are 93.2 million people in Iran and 72.6 million in Tanzania: about 30% more people than Tanzania.
Since 1950 the two have moved differently: Iran's population is 5.6 times what it was in 1950, while Tanzania's population is 9.5 times what it was in 1950.
Iran's population is expected to peak in 2053; Tanzania's population is still growing in 2100. The UN expects Tanzania to have more people than Iran from 2038. In 2100: 80.0 million in Iran, 263 million in Tanzania (UN projection, medium).
Show the numbers
| Year | Iran: people | Tanzania: people | Iran: half older than | Tanzania: half older than | Iran: children per woman | Tanzania: children per woman | Iran: life expectancy | Tanzania: life expectancy |
|---|---|---|---|---|---|---|---|---|
| 1950 | 16.5105 million | 7.62516 million | 21.7 | 17.0 | 6.97 | 6.18 | 38.2 | 41.0 |
| 1960 | 21.4704 million | 9.90142 million | 19.0 | 17.3 | 7.52 | 6.54 | 43.3 | 42.6 |
| 1970 | 29.1451 million | 13.4927 million | 17.5 | 17.0 | 6.80 | 7.00 | 50.2 | 46.5 |
| 1980 | 39.8423 million | 19.1898 million | 18.2 | 16.4 | 6.63 | 6.99 | 58.4 | 51.3 |
| 1990 | 58.3801 million | 26.1102 million | 18.1 | 16.5 | 4.93 | 6.20 | 64.1 | 52.0 |
| 2000 | 66.4187 million | 34.2601 million | 21.2 | 17.4 | 2.00 | 5.67 | 70.2 | 53.2 |
| 2010 | 77.4208 million | 44.7585 million | 27.1 | 17.1 | 1.75 | 5.22 | 74.4 | 61.1 |
| 2023 | 90.6087 million | 66.6176 million | 33.9 | 18.2 | 1.70 | 4.61 | 77.7 | 67.0 |
| 2030* | 95.4867 million | 80.9131 million | 37.7 | 19.1 | 1.63 | 4.16 | 79.0 | 68.4 |
| 2040* | 99.5243 million | 103.999 million | 41.8 | 20.8 | 1.63 | 3.63 | 81.0 | 70.3 |
| 2050* | 101.862 million | 129.621 million | 44.5 | 22.8 | 1.63 | 3.23 | 82.8 | 71.8 |
| 2060* | 100.971 million | 156.851 million | 47.5 | 24.8 | 1.63 | 2.94 | 84.3 | 73.4 |
| 2070* | 96.7073 million | 184.886 million | 50.7 | 26.9 | 1.64 | 2.72 | 85.8 | 74.8 |
| 2080* | 90.8439 million | 212.537 million | 51.3 | 29.0 | 1.63 | 2.53 | 87.0 | 76.3 |
| 2090* | 85.2486 million | 238.810 million | 51.6 | 31.2 | 1.64 | 2.39 | 88.2 | 77.8 |
| 2100* | 80.0453 million | 262.835 million | 52.9 | 33.3 | 1.64 | 2.26 | 89.3 | 79.2 |
* UN projection, medium variant. People at mid-year; ages and life expectancy in years.
IRN − TZA · 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 Iran and which is Tanzania, 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; Iran is drawn in solid blue squares and Tanzania in open orange squares, so you can see whether each is ahead of the crowd, behind it or in the middle.
Apparatus
Sources and method
Iran and Tanzania are drawn here from one source and one release: the UN Population Division's World Population Prospects 2024, counted through 2023 and projected on its medium variant after that. Two places read off the same tables can be set against each other; two read off different tables cannot.
For how the median age is derived, why “100 people” can read a person high or low, and what the all-country pictures do and do not count, see the method.
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Sources: UN WPP 2024 · flag-icons. Every source, its licence and how to cite it →
Verified 2026-09-30 · 73 canaries