The World: Population - Age 25-29 (2018) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 63. | Zimbabwe | 1,471,610 | 2018 | |
| 69. | Zambia | 1,301,227 | 2018 | |
| 46. | Yemen | 2,475,794 | 2018 | |
| 168. | Western Sahara | 51,133 | 2018 | |
| 136. | West Bank | 278,465 | 2018 | |
| 220. | Wallis and Futuna | 1,308 | 2018 | |
| 13. | Vietnam | 8,923,826 | 2018 | |
| 43. | Venezuela | 2,584,205 | 2018 | |
| 181. | Vanuatu | 22,836 | 2018 | |
| 35. | Uzbekistan | 3,102,156 | 2018 | |
| 141. | Uruguay | 254,526 | 2018 | |
| 3. | United States of America | 22,784,276 | 2018 | |
| 23. | United Kingdom | 4,479,963 | 2018 | |
| 81. | United Arab Emirates | 895,099 | 2018 | |
| 37. | Ukraine | 3,035,343 | 2018 | |
| 30. | Uganda | 3,399,103 | 2018 | |
| 199. | U.S. Virgin Islands | 6,350 | 2018 | |
| 222. | Tuvalu | 1,091 | 2018 | |
| 206. | Turks and Caicos Islands | 4,194 | 2018 | |
| 107. | Turkmenistan | 532,740 | 2018 | |
| 17. | Turkey | 6,789,555 | 2018 | |
| 84. | Tunisia | 864,480 | 2018 | |
| 159. | Trinidad and Tobago | 83,537 | 2018 | |
| 193. | Tonga | 7,911 | 2018 | |
| 88. | Togo | 681,322 | 2018 | |
| 144. | The Gambia | 187,422 | 2018 | |
| 177. | The Bahamas | 27,721 | 2018 | |
| 20. | Thailand | 5,011,488 | 2018 | |
| 25. | Tanzania | 4,351,066 | 2018 | |
| 86. | Tajikistan | 825,194 | 2018 | |
| 61. | Taiwan | 1,578,587 | 2018 | |
| 50. | Syria | 2,190,975 | 2018 | |
| 109. | Switzerland | 498,786 | 2018 | |
| 91. | Sweden | 663,953 | 2018 | |
| 151. | Swaziland | 149,632 | 2018 | |
| 170. | Suriname | 49,150 | 2018 | |
| 24. | Sudan | 4,431,435 | 2018 | |
| 59. | Sri Lanka | 1,624,133 | 2018 | |
| 42. | Spain | 2,682,410 | 2018 | |
| 33. | South Korea | 3,263,887 | 2018 | |
| 21. | South Africa | 4,879,303 | 2018 | |
| 83. | Somalia | 868,038 | 2018 | |
| 166. | Solomon Islands | 55,456 | 2018 | |
| 155. | Slovenia | 110,839 | 2018 | |
| 117. | Slovakia | 382,940 | 2018 | |
| 212. | Sint Maarten | 3,154 | 2018 | |
| 94. | Singapore | 656,142 | 2018 | |
| 110. | Sierra Leone | 491,215 | 2018 | |
| 196. | Seychelles | 7,121 | 2018 | |
| 112. | Serbia | 443,310 | 2018 | |
| 71. | Senegal | 1,223,020 | 2018 | |
| 36. | Saudi Arabia | 3,048,325 | 2018 | |
| 185. | Sao Tome and Principe | 14,788 | 2018 | |
| 218. | San Marino | 1,747 | 2018 | |
| 183. | Samoa | 17,274 | 2018 | |
| 195. | Saint Vincent and the Grenadines | 7,592 | 2018 | |
| 228. | Saint Pierre and Miquelon | 173 | 2018 | |
| 214. | Saint Martin | 2,546 | 2018 | |
| 187. | Saint Lucia | 11,828 | 2018 | |
| 210. | Saint Kitts and Nevis | 3,919 | 2018 | |
| 226. | Saint Helena | 427 | 2018 | |
| 225. | Saint Barthélemy | 509 | 2018 | |
| 73. | Rwanda | 1,094,213 | 2018 | |
| 11. | Russia | 9,378,806 | 2018 | |
| 67. | Romania | 1,413,484 | 2018 | |
| 115. | Republic of Congo | 409,712 | 2018 | |
| 124. | Qatar | 326,050 | 2018 | |
| 139. | Puerto Rico | 263,391 | 2018 | |
| 95. | Portugal | 641,181 | 2018 | |
| 44. | Poland | 2,568,346 | 2018 | |
| 10. | Philippines | 9,523,590 | 2018 | |
| 41. | Peru | 2,750,055 | 2018 | |
| 92. | Paraguay | 659,707 | 2018 | |
| 102. | Papua New Guinea | 576,909 | 2018 | |
| 134. | Panama | 297,593 | 2018 | |
| 217. | Palau | 1,840 | 2018 | |
| 5. | Pakistan | 19,658,780 | 2018 | |
| 118. | Oman | 366,556 | 2018 | |
| 126. | Norway | 322,330 | 2018 | |
| 211. | Northern Mariana Islands | 3,413 | 2018 | |
| 53. | North Korea | 2,024,896 | 2018 | |
| 7. | Nigeria | 15,068,488 | 2018 | |
| 66. | Niger | 1,442,689 | 2018 | |
| 98. | Nicaragua | 610,245 | 2018 | |
| 129. | New Zealand | 310,513 | 2018 | |
| 180. | New Caledonia | 23,137 | 2018 | |
| 188. | Netherlands Antilles | 10,905 | 2018 | |
| 72. | Netherlands | 1,101,066 | 2018 | |
| 34. | Nepal | 3,231,241 | 2018 | |
| 223. | Nauru | 837 | 2018 | |
| 142. | Namibia | 235,050 | 2018 | |
| 19. | Myanmar | 5,073,132 | 2018 | |
| 51. | Mozambique | 2,184,193 | 2018 | |
| 40. | Morocco | 2,816,149 | 2018 | |
| 227. | Montserrat | 353 | 2018 | |
| 173. | Montenegro | 41,213 | 2018 | |
| 125. | Mongolia | 322,703 | 2018 | |
| 219. | Monaco | 1,441 | 2018 | |
| 138. | Moldova | 268,802 | 2018 | |
| 9. | Mexico | 9,967,335 | 2018 |
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