The World: Population - Age 30-34 (1981) - Top 100+
| Rank | Country | Population | Year | |
|---|---|---|---|---|
| 1. | United States of America | 18,731,464 | 1981 | |
| 2. | Indonesia | 8,522,751 | 1981 | |
| 3. | Brazil | 8,466,552 | 1981 | |
| 4. | Bangladesh | 5,467,532 | 1981 | |
| 5. | Pakistan | 4,990,746 | 1981 | |
| 6. | Nigeria | 4,797,081 | 1981 | |
| 7. | Mexico | 4,023,805 | 1981 | |
| 8. | Philippines | 3,234,317 | 1981 | |
| 9. | Turkey | 2,817,242 | 1981 | |
| 10. | Ethiopia | 2,339,386 | 1981 | |
| 11. | Argentina | 2,015,138 | 1981 | |
| 12. | Myanmar | 1,956,474 | 1981 | |
| 13. | Democratic Republic of the Congo | 1,816,638 | 1981 | |
| 14. | Colombia | 1,705,198 | 1981 | |
| 15. | Sri Lanka | 1,145,314 | 1981 | |
| 16. | Peru | 1,106,617 | 1981 | |
| 17. | Tanzania | 1,090,418 | 1981 | |
| 18. | Nepal | 921,735 | 1981 | |
| 19. | Malaysia | 895,309 | 1981 | |
| 20. | Kenya | 878,091 | 1981 | |
| 21. | Afghanistan | 860,633 | 1981 | |
| 22. | Mozambique | 771,702 | 1981 | |
| 23. | Uganda | 609,267 | 1981 | |
| 24. | Cote d'Ivoire | 599,224 | 1981 | |
| 25. | Serbia | 593,753 | 1981 | |
| 26. | Cameroon | 548,295 | 1981 | |
| 27. | Ghana | 538,818 | 1981 | |
| 28. | Madagascar | 508,446 | 1981 | |
| 29. | Angola | 458,721 | 1981 | |
| 30. | Syria | 435,413 | 1981 | |
| 31. | Mali | 415,371 | 1981 | |
| 32. | Guatemala | 415,068 | 1981 | |
| 33. | Cambodia | 409,268 | 1981 | |
| 34. | Malawi | 386,543 | 1981 | |
| 35. | Niger | 377,111 | 1981 | |
| 36. | Haiti | 362,109 | 1981 | |
| 37. | Dominican Republic | 359,145 | 1981 | |
| 38. | Burkina Faso | 347,512 | 1981 | |
| 39. | Zambia | 338,013 | 1981 | |
| 40. | Senegal | 337,587 | 1981 | |
| 41. | Rwanda | 295,579 | 1981 | |
| 42. | Somalia | 284,948 | 1981 | |
| 43. | Guinea | 284,176 | 1981 | |
| 44. | Chad | 275,920 | 1981 | |
| 45. | Burundi | 253,588 | 1981 | |
| 46. | Sierra Leone | 219,778 | 1981 | |
| 47. | Benin | 198,849 | 1981 | |
| 48. | Honduras | 191,321 | 1981 | |
| 49. | Paraguay | 184,255 | 1981 | |
| 50. | Papua New Guinea | 183,471 | 1981 | |
| 51. | Libya | 181,710 | 1981 | |
| 52. | Togo | 159,762 | 1981 | |
| 53. | Lebanon | 159,590 | 1981 | |
| 54. | Eritrea | 157,257 | 1981 | |
| 55. | Nicaragua | 157,242 | 1981 | |
| 56. | Panama | 129,324 | 1981 | |
| 57. | Central African Republic | 127,741 | 1981 | |
| 58. | Liberia | 122,295 | 1981 | |
| 59. | Jordan | 113,321 | 1981 | |
| 60. | Mauritania | 92,119 | 1981 | |
| 61. | Republic of Congo | 90,807 | 1981 | |
| 62. | Kosovo | 84,723 | 1981 | |
| 63. | Lesotho | 81,066 | 1981 | |
| 64. | Trinidad and Tobago | 74,574 | 1981 | |
| 65. | Namibia | 63,811 | 1981 | |
| 66. | Guinea-Bissau | 50,280 | 1981 | |
| 67. | Botswana | 46,178 | 1981 | |
| 68. | Guyana | 44,383 | 1981 | |
| 69. | Gabon | 43,466 | 1981 | |
| 70. | Swaziland | 35,975 | 1981 | |
| 71. | Bhutan | 33,009 | 1981 | |
| 72. | Bahrain | 31,993 | 1981 | |
| 73. | Djibouti | 24,083 | 1981 | |
| 74. | Suriname | 19,030 | 1981 | |
| 75. | Comoros | 18,452 | 1981 | |
| 76. | Barbados | 16,220 | 1981 | |
| 77. | Brunei | 14,214 | 1981 | |
| 78. | The Bahamas | 13,937 | 1981 | |
| 79. | Solomon Islands | 12,786 | 1981 | |
| 80. | Western Sahara | 8,287 | 1981 | |
| 81. | Cape Verde | 8,132 | 1981 | |
| 82. | Vanuatu | 7,428 | 1981 | |
| 83. | Belize | 7,036 | 1981 | |
| 84. | Samoa | 6,901 | 1981 | |
| 85. | Saint Lucia | 5,829 | 1981 | |
| 86. | Aruba | 4,904 | 1981 | |
| 87. | Grenada | 4,112 | 1981 | |
| 88. | Sao Tome and Principe | 3,903 | 1981 | |
| 89. | Dominica | 3,533 | 1981 | |
| 90. | Seychelles | 3,300 | 1981 | |
| 91. | Saint Kitts and Nevis | 1,789 | 1981 | |
| 92. | Tuvalu | 463 | 1981 |
