The World: Population - Age 20-24 (1981) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 1. | United States of America | 21,662,844 | 1981 | |
| 2. | Indonesia | 14,470,433 | 1981 | |
| 3. | Brazil | 12,014,364 | 1981 | |
| 4. | Bangladesh | 8,202,623 | 1981 | |
| 5. | Pakistan | 8,010,864 | 1981 | |
| 6. | Nigeria | 6,691,889 | 1981 | |
| 7. | Mexico | 6,496,804 | 1981 | |
| 8. | Philippines | 4,907,148 | 1981 | |
| 9. | Turkey | 4,163,111 | 1981 | |
| 10. | Ethiopia | 3,301,523 | 1981 | |
| 11. | Myanmar | 3,176,204 | 1981 | |
| 12. | Colombia | 2,827,338 | 1981 | |
| 13. | Democratic Republic of the Congo | 2,534,996 | 1981 | |
| 14. | Argentina | 2,282,646 | 1981 | |
| 15. | Peru | 1,637,781 | 1981 | |
| 16. | Tanzania | 1,584,994 | 1981 | |
| 17. | Sri Lanka | 1,562,595 | 1981 | |
| 18. | Kenya | 1,455,482 | 1981 | |
| 19. | Malaysia | 1,310,049 | 1981 | |
| 20. | Nepal | 1,278,890 | 1981 | |
| 21. | Afghanistan | 1,225,286 | 1981 | |
| 22. | Uganda | 1,105,569 | 1981 | |
| 23. | Mozambique | 1,086,169 | 1981 | |
| 24. | Ghana | 957,377 | 1981 | |
| 25. | Cameroon | 787,736 | 1981 | |
| 26. | Madagascar | 775,180 | 1981 | |
| 27. | Syria | 737,520 | 1981 | |
| 28. | Cote d'Ivoire | 653,066 | 1981 | |
| 29. | Angola | 643,127 | 1981 | |
| 30. | Cambodia | 631,185 | 1981 | |
| 31. | Guatemala | 605,354 | 1981 | |
| 32. | Dominican Republic | 575,576 | 1981 | |
| 33. | Serbia | 567,736 | 1981 | |
| 34. | Malawi | 563,600 | 1981 | |
| 35. | Mali | 551,055 | 1981 | |
| 36. | Somalia | 535,011 | 1981 | |
| 37. | Niger | 533,686 | 1981 | |
| 38. | Burkina Faso | 515,640 | 1981 | |
| 39. | Zambia | 507,312 | 1981 | |
| 40. | Haiti | 501,444 | 1981 | |
| 41. | Senegal | 501,262 | 1981 | |
| 42. | Rwanda | 489,562 | 1981 | |
| 43. | Burundi | 416,369 | 1981 | |
| 44. | Guinea | 392,526 | 1981 | |
| 45. | Chad | 384,422 | 1981 | |
| 46. | Honduras | 318,502 | 1981 | |
| 47. | Paraguay | 313,403 | 1981 | |
| 48. | Lebanon | 293,093 | 1981 | |
| 49. | Benin | 284,008 | 1981 | |
| 50. | Nicaragua | 263,940 | 1981 | |
| 51. | Libya | 256,613 | 1981 | |
| 52. | Papua New Guinea | 255,616 | 1981 | |
| 53. | Togo | 236,634 | 1981 | |
| 54. | Sierra Leone | 236,313 | 1981 | |
| 55. | Central African Republic | 196,413 | 1981 | |
| 56. | Eritrea | 193,144 | 1981 | |
| 57. | Panama | 181,556 | 1981 | |
| 58. | Jordan | 179,099 | 1981 | |
| 59. | Liberia | 163,751 | 1981 | |
| 60. | Republic of Congo | 151,665 | 1981 | |
| 61. | Kosovo | 139,139 | 1981 | |
| 62. | Mauritania | 133,528 | 1981 | |
| 63. | Lesotho | 123,538 | 1981 | |
| 64. | Trinidad and Tobago | 117,300 | 1981 | |
| 65. | Namibia | 89,201 | 1981 | |
| 66. | Botswana | 78,687 | 1981 | |
| 67. | Guyana | 75,797 | 1981 | |
| 68. | Guinea-Bissau | 68,083 | 1981 | |
| 69. | Gabon | 64,007 | 1981 | |
| 70. | Swaziland | 54,227 | 1981 | |
| 71. | Bahrain | 42,402 | 1981 | |
| 72. | Bhutan | 36,380 | 1981 | |
| 73. | Suriname | 34,168 | 1981 | |
| 74. | Djibouti | 29,815 | 1981 | |
| 75. | Cape Verde | 27,640 | 1981 | |
| 76. | Comoros | 26,103 | 1981 | |
| 77. | Barbados | 25,706 | 1981 | |
| 78. | Brunei | 22,670 | 1981 | |
| 79. | The Bahamas | 20,919 | 1981 | |
| 80. | Solomon Islands | 18,934 | 1981 | |
| 81. | Samoa | 15,085 | 1981 | |
| 82. | Belize | 13,132 | 1981 | |
| 83. | Western Sahara | 12,367 | 1981 | |
| 84. | Saint Lucia | 11,057 | 1981 | |
| 85. | Vanuatu | 10,953 | 1981 | |
| 86. | Grenada | 9,314 | 1981 | |
| 87. | Sao Tome and Principe | 7,975 | 1981 | |
| 88. | Dominica | 6,695 | 1981 | |
| 89. | Seychelles | 6,618 | 1981 | |
| 90. | Aruba | 6,304 | 1981 | |
| 91. | Saint Kitts and Nevis | 4,729 | 1981 | |
| 92. | Tuvalu | 791 | 1981 |
