The World: Population - Age 20-24 (2018) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 20. | Thailand | 5,085,845 | 2018 | |
| 176. | The Bahamas | 27,818 | 2018 | |
| 142. | The Gambia | 205,458 | 2018 | |
| 86. | Togo | 732,407 | 2018 | |
| 190. | Tonga | 9,798 | 2018 | |
| 164. | Trinidad and Tobago | 69,010 | 2018 | |
| 83. | Tunisia | 829,576 | 2018 | |
| 15. | Turkey | 6,848,319 | 2018 | |
| 107. | Turkmenistan | 509,990 | 2018 | |
| 206. | Turks and Caicos Islands | 3,836 | 2018 | |
| 222. | Tuvalu | 1,086 | 2018 | |
| 200. | U.S. Virgin Islands | 6,045 | 2018 | |
| 27. | Uganda | 4,158,131 | 2018 | |
| 49. | Ukraine | 2,312,387 | 2018 | |
| 106. | United Arab Emirates | 514,647 | 2018 | |
| 28. | United Kingdom | 4,058,128 | 2018 | |
| 4. | United States of America | 21,447,494 | 2018 | |
| 134. | Uruguay | 269,616 | 2018 | |
| 39. | Uzbekistan | 2,878,175 | 2018 | |
| 180. | Vanuatu | 22,397 | 2018 | |
| 42. | Venezuela | 2,739,512 | 2018 | |
| 13. | Vietnam | 7,936,976 | 2018 | |
| 220. | Wallis and Futuna | 1,204 | 2018 | |
| 127. | West Bank | 303,001 | 2018 | |
| 167. | Western Sahara | 57,152 | 2018 | |
| 40. | Yemen | 2,824,722 | 2018 | |
| 62. | Zambia | 1,568,106 | 2018 | |
| 65. | Zimbabwe | 1,515,911 | 2018 |
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