The World: Population - Age 30-34 (2018) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 212. | British Virgin Islands | 3,103 | 2018 | |
| 5. | Brazil | 16,934,970 | 2018 | |
| 143. | Botswana | 201,738 | 2018 | |
| 124. | Bosnia and Herzegovina | 325,464 | 2018 | |
| 75. | Bolivia | 922,210 | 2018 | |
| 161. | Bhutan | 74,091 | 2018 | |
| 206. | Bermuda | 4,203 | 2018 | |
| 86. | Benin | 737,774 | 2018 | |
| 175. | Belize | 28,805 | 2018 | |
| 92. | Belgium | 634,603 | 2018 | |
| 83. | Belarus | 811,222 | 2018 | |
| 182. | Barbados | 20,334 | 2018 | |
| 7. | Bangladesh | 13,025,889 | 2018 | |
| 147. | Bahrain | 162,558 | 2018 | |
| 77. | Azerbaijan | 903,007 | 2018 | |
| 102. | Austria | 512,074 | 2018 | |
| 54. | Australia | 1,671,966 | 2018 | |
| 191. | Aruba | 8,166 | 2018 | |
| 131. | Armenia | 295,509 | 2018 | |
| 32. | Argentina | 3,238,590 | 2018 | |
| 197. | Antigua and Barbuda | 6,789 | 2018 | |
| 220. | Anguilla | 1,227 | 2018 | |
| 62. | Angola | 1,355,901 | 2018 | |
| 205. | Andorra | 4,204 | 2018 | |
| 202. | American Samoa | 5,013 | 2018 | |
| 29. | Algeria | 3,624,430 | 2018 | |
| 137. | Albania | 255,889 | 2018 | |
| 47. | Afghanistan | 2,230,438 | 2018 |
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