The World: Population - Age 20-24 (2021) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 213. | British Virgin Islands | 2,583 | 2021 | |
| 7. | Brazil | 17,412,288 | 2021 | |
| 139. | Botswana | 238,280 | 2021 | |
| 135. | Bosnia and Herzegovina | 250,611 | 2021 | |
| 79. | Bolivia | 1,090,788 | 2021 | |
| 163. | Bhutan | 70,001 | 2021 | |
| 203. | Bermuda | 4,293 | 2021 | |
| 75. | Benin | 1,173,008 | 2021 | |
| 171. | Belize | 37,510 | 2021 | |
| 97. | Belgium | 590,738 | 2021 | |
| 111. | Belarus | 456,243 | 2021 | |
| 185. | Barbados | 18,190 | 2021 | |
| 8. | Bangladesh | 16,957,138 | 2021 | |
| 152. | Bahrain | 127,438 | 2021 | |
| 90. | Azerbaijan | 675,586 | 2021 | |
| 112. | Austria | 441,099 | 2021 | |
| 64. | Australia | 1,539,860 | 2021 | |
| 194. | Aruba | 7,439 | 2021 | |
| 147. | Armenia | 176,947 | 2021 | |
| 33. | Argentina | 3,417,375 | 2021 | |
| 192. | Antigua and Barbuda | 8,265 | 2021 | |
| 220. | Anguilla | 1,273 | 2021 | |
| 51. | Angola | 2,240,628 | 2021 | |
| 204. | Andorra | 4,289 | 2021 | |
| 198. | American Samoa | 6,494 | 2021 | |
| 38. | Algeria | 2,888,786 | 2021 | |
| 137. | Albania | 248,321 | 2021 | |
| 29. | Afghanistan | 3,990,480 | 2021 |
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