The World: Population - Age 20-24 (2018) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 30. | Afghanistan | 3,664,920 | 2018 | |
| 131. | Albania | 281,351 | 2018 | |
| 35. | Algeria | 3,247,934 | 2018 | |
| 197. | American Samoa | 6,968 | 2018 | |
| 207. | Andorra | 3,781 | 2018 | |
| 54. | Angola | 2,065,476 | 2018 | |
| 221. | Anguilla | 1,160 | 2018 | |
| 193. | Antigua and Barbuda | 7,970 | 2018 | |
| 33. | Argentina | 3,343,663 | 2018 | |
| 141. | Armenia | 215,557 | 2018 | |
| 195. | Aruba | 7,851 | 2018 | |
| 63. | Australia | 1,561,926 | 2018 | |
| 111. | Austria | 478,701 | 2018 | |
| 84. | Azerbaijan | 776,633 | 2018 | |
| 153. | Bahrain | 124,065 | 2018 | |
| 8. | Bangladesh | 15,771,320 | 2018 | |
| 185. | Barbados | 18,489 | 2018 | |
| 110. | Belarus | 494,771 | 2018 | |
| 98. | Belgium | 599,232 | 2018 | |
| 173. | Belize | 36,390 | 2018 | |
| 77. | Benin | 1,062,709 | 2018 | |
| 204. | Bermuda | 4,268 | 2018 | |
| 163. | Bhutan | 71,407 | 2018 | |
| 78. | Bolivia | 1,052,722 | 2018 | |
| 136. | Bosnia and Herzegovina | 265,677 | 2018 | |
| 139. | Botswana | 235,299 | 2018 | |
| 7. | Brazil | 16,969,940 | 2018 | |
| 213. | British Virgin Islands | 2,515 | 2018 | |
| 171. | Brunei | 40,204 | 2018 | |
| 126. | Bulgaria | 309,127 | 2018 | |
| 56. | Burkina Faso | 1,913,611 | 2018 | |
| 74. | Burundi | 1,158,845 | 2018 | |
| 67. | Cambodia | 1,483,654 | 2018 | |
| 52. | Cameroon | 2,120,578 | 2018 | |
| 51. | Canada | 2,207,275 | 2018 | |
| 168. | Cape Verde | 56,161 | 2018 | |
| 208. | Cayman Islands | 3,737 | 2018 | |
| 103. | Central African Republic | 536,291 | 2018 | |
| 71. | Chad | 1,194,854 | 2018 | |
| 196. | Channel Islands | 7,770 | 2018 | |
| 69. | Chile | 1,374,231 | 2018 | |
| 2. | China | 93,559,320 | 2018 | |
| 26. | Colombia | 4,160,070 | 2018 | |
| 162. | Comoros | 72,033 | 2018 | |
| 224. | Cook Islands | 725 | 2018 | |
| 114. | Costa Rica | 410,661 | 2018 | |
| 47. | Cote d'Ivoire | 2,430,361 | 2018 | |
| 132. | Croatia | 277,316 | 2018 | |
| 88. | Cuba | 701,512 | 2018 | |
| 156. | Cyprus | 95,172 | 2018 | |
| 109. | Czech Republic | 494,883 | 2018 | |
| 12. | Democratic Republic of the Congo | 8,618,110 | 2018 | |
| 116. | Denmark | 375,941 | 2018 | |
| 158. | Djibouti | 93,926 | 2018 | |
| 201. | Dominica | 5,727 | 2018 | |
| 80. | Dominican Republic | 961,491 | 2018 | |
| 152. | East Timor | 124,547 | 2018 | |
| 66. | Ecuador | 1,489,408 | 2018 | |
| 14. | Egypt | 7,769,449 | 2018 | |
| 95. | El Salvador | 619,090 | 2018 | |
| 161. | Equatorial Guinea | 72,884 | 2018 | |
| 90. | Eritrea | 669,205 | 2018 | |
| 166. | Estonia | 58,433 | 2018 | |
| 11. | Ethiopia | 9,780,538 | 2018 | |
| 210. | Faroe Islands | 3,704 | 2018 | |
| 191. | Federated States of Micronesia | 9,381 | 2018 | |
| 160. | Fiji | 75,440 | 2018 | |
| 124. | Finland | 314,382 | 2018 | |
| 29. | France | 3,919,337 | 2018 | |
| 181. | French Polynesia | 22,044 | 2018 | |
| 148. | Gabon | 171,526 | 2018 | |
| 145. | Gaza Strip | 185,576 | 2018 | |
| 133. | Georgia | 270,410 | 2018 | |
| 24. | Germany | 4,202,753 | 2018 | |
| 44. | Ghana | 2,610,365 | 2018 | |
| 215. | Gibraltar | 2,198 | 2018 | |
| 104. | Greece | 527,542 | 2018 | |
| 203. | Greenland | 4,628 | 2018 | |
| 192. | Grenada | 8,380 | 2018 | |
| 186. | Guam | 16,365 | 2018 | |
| 59. | Guatemala | 1,651,295 | 2018 | |
| 205. | Guernsey | 3,895 | 2018 | |
| 72. | Guinea | 1,163,498 | 2018 | |
| 147. | Guinea-Bissau | 173,512 | 2018 | |
| 159. | Guyana | 78,147 | 2018 | |
| 76. | Haiti | 1,101,755 | 2018 | |
| 82. | Honduras | 927,889 | 2018 | |
| 117. | Hong Kong | 370,472 | 2018 | |
| 100. | Hungary | 556,281 | 2018 | |
| 179. | Iceland | 22,523 | 2018 | |
| 1. | India | 113,834,752 | 2018 | |
| 3. | Indonesia | 21,941,460 | 2018 | |
| 16. | Iran | 6,771,424 | 2018 | |
| 34. | Iraq | 3,292,369 | 2018 | |
| 129. | Ireland | 293,610 | 2018 | |
| 202. | Isle of Man | 5,166 | 2018 | |
| 94. | Israel | 625,494 | 2018 | |
| 36. | Italy | 3,048,345 | 2018 | |
| 121. | Jamaica | 319,397 | 2018 | |
| 18. | Japan | 6,204,186 | 2018 |
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