The World: Population - Age 30-34 (2020) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 213. | British Virgin Islands | 3,284 | 2020 | |
| 6. | Brazil | 16,971,612 | 2020 | |
| 143. | Botswana | 204,955 | 2020 | |
| 126. | Bosnia and Herzegovina | 333,515 | 2020 | |
| 75. | Bolivia | 949,193 | 2020 | |
| 161. | Bhutan | 76,400 | 2020 | |
| 206. | Bermuda | 4,212 | 2020 | |
| 85. | Benin | 780,152 | 2020 | |
| 175. | Belize | 30,391 | 2020 | |
| 92. | Belgium | 648,102 | 2020 | |
| 87. | Belarus | 778,096 | 2020 | |
| 182. | Barbados | 19,947 | 2020 | |
| 7. | Bangladesh | 13,670,500 | 2020 | |
| 148. | Bahrain | 164,309 | 2020 | |
| 76. | Azerbaijan | 944,724 | 2020 | |
| 106. | Austria | 512,515 | 2020 | |
| 55. | Australia | 1,696,354 | 2020 | |
| 192. | Aruba | 8,025 | 2020 | |
| 131. | Armenia | 301,535 | 2020 | |
| 32. | Argentina | 3,296,369 | 2020 | |
| 197. | Antigua and Barbuda | 6,925 | 2020 | |
| 221. | Anguilla | 1,272 | 2020 | |
| 61. | Angola | 1,439,740 | 2020 | |
| 209. | Andorra | 3,851 | 2020 | |
| 201. | American Samoa | 5,433 | 2020 | |
| 29. | Algeria | 3,568,668 | 2020 | |
| 136. | Albania | 272,988 | 2020 | |
| 43. | Afghanistan | 2,486,682 | 2020 |
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