The World: Population - Age 20-24 (2021) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 29. | Afghanistan | 3,990,480 | 2021 | |
| 137. | Albania | 248,321 | 2021 | |
| 38. | Algeria | 2,888,786 | 2021 | |
| 198. | American Samoa | 6,494 | 2021 | |
| 204. | Andorra | 4,289 | 2021 | |
| 51. | Angola | 2,240,628 | 2021 | |
| 220. | Anguilla | 1,273 | 2021 | |
| 192. | Antigua and Barbuda | 8,265 | 2021 | |
| 33. | Argentina | 3,417,375 | 2021 | |
| 147. | Armenia | 176,947 | 2021 | |
| 194. | Aruba | 7,439 | 2021 | |
| 64. | Australia | 1,539,860 | 2021 | |
| 112. | Austria | 441,099 | 2021 | |
| 90. | Azerbaijan | 675,586 | 2021 | |
| 152. | Bahrain | 127,438 | 2021 | |
| 8. | Bangladesh | 16,957,138 | 2021 | |
| 185. | Barbados | 18,190 | 2021 | |
| 111. | Belarus | 456,243 | 2021 | |
| 97. | Belgium | 590,738 | 2021 | |
| 171. | Belize | 37,510 | 2021 | |
| 75. | Benin | 1,173,008 | 2021 | |
| 203. | Bermuda | 4,293 | 2021 | |
| 163. | Bhutan | 70,001 | 2021 | |
| 79. | Bolivia | 1,090,788 | 2021 | |
| 135. | Bosnia and Herzegovina | 250,611 | 2021 | |
| 139. | Botswana | 238,280 | 2021 | |
| 7. | Brazil | 17,412,288 | 2021 | |
| 213. | British Virgin Islands | 2,583 | 2021 | |
| 170. | Brunei | 40,031 | 2021 | |
| 127. | Bulgaria | 299,461 | 2021 | |
| 54. | Burkina Faso | 2,084,058 | 2021 | |
| 72. | Burundi | 1,284,491 | 2021 | |
| 68. | Cambodia | 1,410,579 | 2021 | |
| 50. | Cameroon | 2,290,079 | 2021 | |
| 53. | Canada | 2,085,494 | 2021 | |
| 169. | Cape Verde | 53,950 | 2021 | |
| 208. | Cayman Islands | 3,779 | 2021 | |
| 100. | Central African Republic | 570,136 | 2021 | |
| 71. | Chad | 1,311,197 | 2021 | |
| 197. | Channel Islands | 7,209 | 2021 | |
| 70. | Chile | 1,313,931 | 2021 | |
| 2. | China | 82,135,672 | 2021 | |
| 27. | Colombia | 4,058,231 | 2021 | |
| 160. | Comoros | 80,814 | 2021 | |
| 225. | Cook Islands | 601 | 2021 | |
| 114. | Costa Rica | 398,602 | 2021 | |
| 46. | Cote d'Ivoire | 2,595,866 | 2021 | |
| 136. | Croatia | 250,018 | 2021 | |
| 89. | Cuba | 698,461 | 2021 | |
| 158. | Cyprus | 85,459 | 2021 | |
| 109. | Czech Republic | 459,634 | 2021 | |
| 12. | Democratic Republic of the Congo | 9,153,337 | 2021 | |
| 117. | Denmark | 367,443 | 2021 | |
| 155. | Djibouti | 97,303 | 2021 | |
| 202. | Dominica | 4,764 | 2021 | |
| 81. | Dominican Republic | 976,581 | 2021 | |
| 153. | East Timor | 126,162 | 2021 | |
| 66. | Ecuador | 1,512,550 | 2021 | |
| 13. | Egypt | 8,120,208 | 2021 | |
| 98. | El Salvador | 589,164 | 2021 | |
| 161. | Equatorial Guinea | 79,643 | 2021 | |
| 87. | Eritrea | 737,539 | 2021 | |
| 167. | Estonia | 55,334 | 2021 | |
| 9. | Ethiopia | 11,100,503 | 2021 | |
| 210. | Faroe Islands | 3,572 | 2021 | |
| 191. | Federated States of Micronesia | 8,932 | 2021 | |
| 162. | Fiji | 70,058 | 2021 | |
| 128. | Finland | 294,742 | 2021 | |
| 28. | France | 4,040,128 | 2021 | |
| 182. | French Polynesia | 21,648 | 2021 | |
| 144. | Gabon | 184,440 | 2021 | |
| 141. | Gaza Strip | 201,254 | 2021 | |
| 138. | Georgia | 238,760 | 2021 | |
| 26. | Germany | 4,160,707 | 2021 | |
| 43. | Ghana | 2,707,409 | 2021 | |
| 216. | Gibraltar | 1,948 | 2021 | |
| 104. | Greece | 525,459 | 2021 | |
| 205. | Greenland | 4,170 | 2021 | |
| 193. | Grenada | 7,529 | 2021 | |
| 186. | Guam | 17,106 | 2021 | |
| 61. | Guatemala | 1,666,405 | 2021 | |
| 207. | Guernsey | 3,789 | 2021 | |
| 73. | Guinea | 1,269,531 | 2021 | |
| 146. | Guinea-Bissau | 183,504 | 2021 | |
| 159. | Guyana | 82,405 | 2021 | |
| 77. | Haiti | 1,119,167 | 2021 | |
| 82. | Honduras | 962,239 | 2021 | |
| 121. | Hong Kong | 309,881 | 2021 | |
| 105. | Hungary | 508,479 | 2021 | |
| 181. | Iceland | 21,942 | 2021 | |
| 1. | India | 115,727,616 | 2021 | |
| 3. | Indonesia | 22,281,752 | 2021 | |
| 18. | Iran | 5,968,120 | 2021 | |
| 32. | Iraq | 3,521,064 | 2021 | |
| 122. | Ireland | 308,777 | 2021 | |
| 201. | Isle of Man | 5,070 | 2021 | |
| 91. | Israel | 662,560 | 2021 | |
| 36. | Italy | 3,041,512 | 2021 | |
| 125. | Jamaica | 305,450 | 2021 | |
| 17. | Japan | 6,081,054 | 2021 |
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