The World: Population - Age 20-24 (2021) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 63. | Zimbabwe | 1,560,497 | 2021 | |
| 60. | Zambia | 1,707,163 | 2021 | |
| 35. | Yemen | 3,071,349 | 2021 | |
| 166. | Western Sahara | 61,523 | 2021 | |
| 123. | West Bank | 307,907 | 2021 | |
| 221. | Wallis and Futuna | 1,118 | 2021 | |
| 14. | Vietnam | 7,371,961 | 2021 | |
| 42. | Venezuela | 2,733,448 | 2021 | |
| 180. | Vanuatu | 21,953 | 2021 | |
| 47. | Uzbekistan | 2,572,059 | 2021 | |
| 131. | Uruguay | 262,195 | 2021 | |
| 5. | United States of America | 21,580,684 | 2021 | |
| 30. | United Kingdom | 3,905,818 | 2021 | |
| 102. | United Arab Emirates | 542,736 | 2021 | |
| 56. | Ukraine | 1,987,042 | 2021 | |
| 25. | Uganda | 4,515,179 | 2021 | |
| 200. | U.S. Virgin Islands | 5,549 | 2021 | |
| 222. | Tuvalu | 1,017 | 2021 | |
| 206. | Turks and Caicos Islands | 3,832 | 2021 | |
| 110. | Turkmenistan | 459,017 | 2021 | |
| 15. | Turkey | 6,925,608 | 2021 | |
| 86. | Tunisia | 744,867 | 2021 | |
| 165. | Trinidad and Tobago | 66,178 | 2021 | |
| 190. | Tonga | 9,832 | 2021 | |
| 84. | Togo | 777,018 | 2021 | |
| 140. | The Gambia | 211,798 | 2021 | |
| 176. | The Bahamas | 26,623 | 2021 | |
| 23. | Thailand | 4,587,590 | 2021 | |
| 20. | Tanzania | 5,392,832 | 2021 | |
| 83. | Tajikistan | 798,907 | 2021 | |
| 67. | Taiwan | 1,457,599 | 2021 | |
| 49. | Syria | 2,361,177 | 2021 | |
| 113. | Switzerland | 437,417 | 2021 | |
| 107. | Sweden | 488,195 | 2021 | |
| 150. | Swaziland | 163,219 | 2021 | |
| 168. | Suriname | 54,291 | 2021 | |
| 19. | Sudan | 5,428,400 | 2021 | |
| 62. | Sri Lanka | 1,594,638 | 2021 | |
| 48. | Spain | 2,467,122 | 2021 | |
| 34. | South Korea | 3,108,010 | 2021 | |
| 24. | South Africa | 4,560,814 | 2021 | |
| 78. | Somalia | 1,107,259 | 2021 | |
| 164. | Solomon Islands | 66,374 | 2021 | |
| 156. | Slovenia | 90,442 | 2021 | |
| 129. | Slovakia | 284,766 | 2021 | |
| 211. | Sint Maarten | 3,113 | 2021 | |
| 101. | Singapore | 555,465 | 2021 | |
| 99. | Sierra Leone | 581,164 | 2021 | |
| 199. | Seychelles | 5,886 | 2021 | |
| 115. | Serbia | 380,038 | 2021 | |
| 65. | Senegal | 1,518,465 | 2021 | |
| 40. | Saudi Arabia | 2,788,157 | 2021 | |
| 183. | Sao Tome and Principe | 21,187 | 2021 | |
| 215. | San Marino | 2,066 | 2021 | |
| 184. | Samoa | 19,074 | 2021 | |
| 195. | Saint Vincent and the Grenadines | 7,410 | 2021 | |
| 228. | Saint Pierre and Miquelon | 212 | 2021 | |
| 217. | Saint Martin | 1,715 | 2021 | |
| 188. | Saint Lucia | 11,335 | 2021 | |
| 209. | Saint Kitts and Nevis | 3,753 | 2021 | |
| 226. | Saint Helena | 483 | 2021 | |
| 227. | Saint Barthélemy | 320 | 2021 | |
| 69. | Rwanda | 1,358,892 | 2021 | |
| 16. | Russia | 6,183,362 | 2021 | |
| 76. | Romania | 1,130,160 | 2021 | |
| 103. | Republic of Congo | 541,420 | 2021 | |
| 142. | Qatar | 189,780 | 2021 | |
| 134. | Puerto Rico | 255,576 | 2021 | |
| 95. | Portugal | 627,349 | 2021 | |
| 58. | Poland | 1,898,757 | 2021 | |
| 10. | Philippines | 10,925,015 | 2021 | |
| 41. | Peru | 2,748,111 | 2021 | |
| 93. | Paraguay | 646,656 | 2021 | |
| 88. | Papua New Guinea | 708,164 | 2021 | |
| 119. | Panama | 326,098 | 2021 | |
| 218. | Palau | 1,597 | 2021 | |
| 4. | Pakistan | 21,830,264 | 2021 | |
| 118. | Oman | 332,457 | 2021 | |
| 120. | Norway | 313,036 | 2021 | |
| 212. | Northern Mariana Islands | 2,736 | 2021 | |
| 57. | North Korea | 1,911,567 | 2021 | |
| 6. | Nigeria | 19,580,452 | 2021 | |
| 52. | Niger | 2,103,555 | 2021 | |
| 96. | Nicaragua | 608,254 | 2021 | |
| 126. | New Zealand | 300,277 | 2021 | |
| 177. | New Caledonia | 23,527 | 2021 | |
| 189. | Netherlands Antilles | 9,925 | 2021 | |
| 80. | Netherlands | 1,059,038 | 2021 | |
| 31. | Nepal | 3,573,672 | 2021 | |
| 224. | Nauru | 794 | 2021 | |
| 133. | Namibia | 256,001 | 2021 | |
| 21. | Myanmar | 4,922,250 | 2021 | |
| 37. | Mozambique | 2,947,990 | 2021 | |
| 39. | Morocco | 2,843,907 | 2021 | |
| 223. | Montserrat | 813 | 2021 | |
| 175. | Montenegro | 29,054 | 2021 | |
| 130. | Mongolia | 276,529 | 2021 | |
| 219. | Monaco | 1,471 | 2021 | |
| 143. | Moldova | 185,238 | 2021 | |
| 11. | Mexico | 10,182,424 | 2021 |
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