The World: Population - Age 30-34 (2021) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 212. | British Virgin Islands | 3,406 | 2021 | |
| 6. | Brazil | 16,678,329 | 2021 | |
| 143. | Botswana | 207,110 | 2021 | |
| 126. | Bosnia and Herzegovina | 333,896 | 2021 | |
| 76. | Bolivia | 959,797 | 2021 | |
| 161. | Bhutan | 76,952 | 2021 | |
| 206. | Bermuda | 4,243 | 2021 | |
| 86. | Benin | 804,586 | 2021 | |
| 175. | Belize | 31,138 | 2021 | |
| 92. | Belgium | 657,057 | 2021 | |
| 88. | Belarus | 747,827 | 2021 | |
| 182. | Barbados | 20,158 | 2021 | |
| 7. | Bangladesh | 14,005,106 | 2021 | |
| 149. | Bahrain | 165,345 | 2021 | |
| 75. | Azerbaijan | 960,430 | 2021 | |
| 106. | Austria | 514,670 | 2021 | |
| 55. | Australia | 1,721,317 | 2021 | |
| 192. | Aruba | 8,038 | 2021 | |
| 131. | Armenia | 305,335 | 2021 | |
| 32. | Argentina | 3,329,617 | 2021 | |
| 196. | Antigua and Barbuda | 7,008 | 2021 | |
| 221. | Anguilla | 1,278 | 2021 | |
| 61. | Angola | 1,485,676 | 2021 | |
| 209. | Andorra | 3,823 | 2021 | |
| 200. | American Samoa | 5,740 | 2021 | |
| 29. | Algeria | 3,536,187 | 2021 | |
| 134. | Albania | 279,699 | 2021 | |
| 42. | Afghanistan | 2,617,215 | 2021 |
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