| # | Flag | Country | Population ages 0-14, totalPopulation ages 0-14, total | Year |
|---|---|---|---|---|
| 1 | India | 370,555,446 | 2018 | |
| 2 | China | 245,390,392 | 2018 | |
| 3 | Nigeria | 85,876,759 | 2018 | |
| 4 | Pakistan | 73,567,758 | 2018 | |
| 5 | Indonesia | 72,300,009 | 2018 | |
| 6 | United States | 61,616,346 | 2018 | |
| 7 | Bangladesh | 44,926,992 | 2018 | |
| 8 | Brazil | 44,747,902 | 2018 | |
| 9 | Ethiopia | 43,687,351 | 2018 | |
| 10 | Democratic Republic Of Congo | 38,808,466 | 2018 | |
| 11 | Philippines | 33,569,038 | 2018 | |
| 12 | Mexico | 33,127,858 | 2018 | |
| 13 | Egypt | 32,800,965 | 2018 | |
| 14 | Russia | 25,742,452 | 2018 | |
| 15 | Tanzania | 25,169,361 | 2018 | |
| 16 | Vietnam | 22,006,762 | 2018 | |
| 17 | Kenya | 20,587,453 | 2018 | |
| 18 | Uganda | 20,254,091 | 2018 | |
| 19 | Turkey | 20,226,891 | 2018 | |
| 20 | Iran | 19,348,882 | 2018 | |
| 21 | Sudan | 16,916,816 | 2018 | |
| 22 | South Africa | 16,627,205 | 2018 | |
| 23 | Japan | 16,247,438 | 2018 | |
| 24 | Afghanistan | 15,851,509 | 2018 | |
| 25 | Iraq | 15,468,775 | 2018 | |
| 26 | Angola | 14,362,683 | 2018 | |
| 27 | Myanmar | 14,110,794 | 2018 | |
| 28 | Mozambique | 13,133,048 | 2018 | |
| 29 | Algeria | 12,454,242 | 2018 | |
| 30 | France | 12,050,698 | 2018 | |
| 31 | United Kingdom | 11,852,856 | 2018 | |
| 32 | Thailand | 11,799,126 | 2018 | |
| 33 | Colombia | 11,452,033 | 2018 | |
| 34 | Ghana | 11,412,219 | 2018 | |
| 35 | Yemen | 11,273,740 | 2018 | |
| 36 | Niger | 11,248,005 | 2018 | |
| 37 | Argentina | 10,984,571 | 2018 | |
| 38 | Germany | 10,845,825 | 2018 | |
| 39 | Cameroon | 10,717,559 | 2018 | |
| 40 | Madagascar | 10,679,200 | 2018 | |
| 41 | Ivory Coast | 10,599,607 | 2018 | |
| 42 | Morocco | 9,785,343 | 2018 | |
| 43 | Uzbekistan | 9,234,321 | 2018 | |
| 44 | Mali | 9,067,070 | 2018 | |
| 45 | Burkina Faso | 8,877,910 | 2018 | |
| 46 | Peru | 8,667,845 | 2018 | |
| 47 | Nepal | 8,474,812 | 2018 | |
| 48 | Saudi Arabia | 8,378,491 | 2018 | |
| 49 | Italy | 8,119,921 | 2018 | |
| 50 | Malawi | 7,936,256 | 2018 | |
| 51 | Venezuela | 7,879,069 | 2018 | |
| 52 | Zambia | 7,714,335 | 2018 | |
| 53 | Malaysia | 7,579,172 | 2018 | |
| 54 | Chad | 7,253,467 | 2018 | |
| 55 | Ukraine | 7,044,888 | 2018 | |
| 56 | Somalia | 6,953,312 | 2018 | |
| 57 | South Korea | 6,898,066 | 2018 | |
| 58 | Spain | 6,821,073 | 2018 | |
| 59 | Senegal | 6,773,774 | 2018 | |
| 60 | Syria | 6,043,334 | 2018 | |
| 61 | Canada | 5,966,341 | 2018 | |
| 62 | Guatemala | 5,939,093 | 2018 | |
| 63 | Zimbabwe | 5,915,369 | 2018 | |
| 64 | Poland | 5,647,042 | 2018 | |
| 65 | Guinea | 5,217,984 | 2018 | |
| 66 | North Korea | 5,204,018 | 2018 | |
| 67 | Kazakhstan | 5,179,908 | 2018 | |
| 68 | Sri Lanka | 5,141,702 | 2018 | |
| 69 | Cambodia | 5,071,984 | 2018 | |
| 70 | Burundi | 5,038,604 | 2018 | |
| 71 | Rwanda | 4,893,963 | 2018 | |
| 72 | Benin | 4,875,062 | 2018 | |
| 73 | Ecuador | 4,812,674 | 2018 | |
| 74 | Australia | 4,784,113 | 2018 | |
| 75 | South Sudan | 4,550,106 | 2018 | |
| 76 | Chile | 3,764,786 | 2018 | |
| 77 | Haiti | 3,628,684 | 2018 | |
| 78 | Bolivia | 3,549,185 | 2018 | |
| 79 | Jordan | 3,503,255 | 2018 | |
| 80 | Togo | 3,257,952 | 2018 | |
| 81 | Tajikistan | 3,216,755 | 2018 | |
| 82 | Sierra Leone | 3,193,650 | 2018 | |
| 83 | Dominican Republic | 3,076,682 | 2018 | |
| 84 | Papua New Guinea | 3,063,969 | 2018 | |
| 85 | Honduras | 2,973,989 | 2018 | |
| 86 | Romania | 2,968,212 | 2018 | |
| 87 | Netherlands | 2,796,897 | 2018 | |
| 88 | Tunisia | 2,780,649 | 2018 | |
| 89 | Israel | 2,466,339 | 2018 | |
| 90 | Azerbaijan | 2,316,534 | 2018 | |
| 91 | Laos | 2,297,255 | 2018 | |
| 92 | Republic of the Congo | 2,208,572 | 2018 | |
| 93 | Kyrgyzstan | 2,027,711 | 2018 | |
| 94 | Paraguay | 2,026,753 | 2018 | |
| 95 | Liberia | 1,999,388 | 2018 | |
| 96 | Central African Republic | 1,998,900 | 2018 | |
| 97 | Belgium | 1,961,661 | 2018 | |
| 98 | Libya | 1,860,701 | 2018 | |
| 99 | Nicaragua | 1,848,599 | 2018 | |
| 100 | Turkmenistan | 1,803,521 | 2018 | |
| 101 | Cuba | 1,801,551 | 2018 | |
| 102 | Sweden | 1,798,526 | 2018 | |
| 103 | Mauritania | 1,749,022 | 2018 | |
| 104 | El Salvador | 1,737,565 | 2018 | |
| 105 | Czech Republic | 1,650,666 | 2018 | |
| 106 | Belarus | 1,612,239 | 2018 | |
| 107 | Lebanon | 1,545,064 | 2018 | |
| 108 | Greece | 1,513,478 | 2018 | |
| 109 | Hungary | 1,396,972 | 2018 | |
| 110 | Portugal | 1,377,708 | 2018 | |
| 111 | Eritrea | 1,343,521 | 2011 | |
| 112 | United Arab Emirates | 1,337,644 | 2018 | |
| 113 | Switzerland | 1,271,030 | 2018 | |
| 114 | Austria | 1,247,629 | 2018 | |
| 115 | Serbia | 1,139,838 | 2018 | |
| 116 | Panama | 1,133,015 | 2018 | |
| 117 | Costa Rica | 1,069,758 | 2018 | |
| 118 | Republic of Ireland | 1,044,881 | 2018 | |
| 119 | Oman | 1,043,043 | 2018 | |
| 120 | Gambia | 1,027,734 | 2018 | |
| 121 | Bulgaria | 1,010,933 | 2018 | |
| 122 | New Zealand | 965,123 | 2018 | |
| 123 | Denmark | 953,577 | 2018 | |
| 124 | Mongolia | 948,546 | 2018 | |
| 125 | Norway | 943,876 | 2018 | |
| 126 | Finland | 908,729 | 2018 | |
| 127 | Namibia | 892,906 | 2018 | |
| 128 | Hong Kong | 887,630 | 2018 | |
| 129 | Kuwait | 878,088 | 2018 | |
| 130 | Slovakia | 842,176 | 2018 | |
| 131 | Singapore | 831,072 | 2018 | |
| 132 | Guinea-Bissau | 774,831 | 2018 | |
| 133 | Gabon | 760,690 | 2018 | |
| 134 | Lesotho | 743,207 | 2018 | |
| 135 | Georgia | 724,442 | 2018 | |
| 136 | Uruguay | 720,882 | 2018 | |
| 137 | Botswana | 702,459 | 2018 | |
| 138 | Jamaica | 664,334 | 2018 | |
| 139 | Croatia | 602,724 | 2018 | |
| 140 | Armenia | 592,522 | 2018 | |
| 141 | Puerto Rico | 563,636 | 2018 | |
| 142 | Moldova | 559,268 | 2018 | |
| 143 | East Timor | 551,875 | 2018 | |
| 144 | Albania | 490,416 | 2018 | |
| 145 | Equatorial Guinea | 484,748 | 2018 | |
| 146 | Bosnia and Herzegovina | 470,420 | 2018 | |
| 147 | Swaziland | 420,356 | 2018 | |
| 148 | Lithuania | 418,286 | 2018 | |
| 149 | Qatar | 386,337 | 2018 | |
| 150 | Republic of Macedonia | 345,346 | 2018 | |
| 151 | Comoros | 329,102 | 2018 | |
| 152 | Slovenia | 312,373 | 2018 | |
| 153 | Bahrain | 300,954 | 2018 | |
| 154 | Latvia | 300,103 | 2018 | |
| 155 | Djibouti | 293,353 | 2018 | |
| 156 | Trinidad and Tobago | 285,498 | 2018 | |
| 157 | Solomon Islands | 251,144 | 2018 | |
| 158 | Fiji | 250,369 | 2018 | |
| 159 | Mauritius | 225,950 | 2018 | |
| 160 | Guyana | 222,777 | 2018 | |
| 161 | Estonia | 218,813 | 2018 | |
| 162 | Cyprus | 199,521 | 2018 | |
| 163 | Bhutan | 197,777 | 2018 | |
| 164 | Cape Verde | 162,021 | 2018 | |
| 165 | Suriname | 150,786 | 2018 | |
| 166 | Maldives | 120,457 | 2018 | |
| 167 | Belize | 118,331 | 2018 | |
| 168 | Montenegro | 111,967 | 2018 | |
| 169 | Vanuatu | 104,703 | 2018 | |
| 170 | Luxembourg | 100,061 | 2018 | |
| 171 | Brunei | 97,103 | 2018 | |
| 172 | São Tomé and Príncipe | 89,566 | 2018 | |
| 173 | Macao | 86,974 | 2018 | |
| 174 | The Bahamas | 79,008 | 2018 | |
| 175 | Samoa | 71,301 | 2018 | |
| 176 | Iceland | 70,869 | 2018 | |
| 177 | Malta | 69,962 | 2018 | |
| 178 | French Polynesia | 63,623 | 2018 | |
| 179 | New Caledonia | 63,409 | 2018 | |
| 180 | Barbados | 54,243 | 2018 | |
| 181 | Kiribati | 40,905 | 2018 | |
| 182 | Guam | 40,408 | 2018 | |
| 183 | Federated States of Micronesia | 36,874 | 2018 | |
| 184 | Tonga | 36,492 | 2018 | |
| 185 | Saint Lucia | 33,589 | 2018 | |
| 186 | Curacao | 29,643 | 2018 | |
| 187 | Grenada | 29,358 | 2018 | |
| 188 | Saint Vincent and the Grenadines | 25,927 | 2018 | |
| 189 | Antigua and Barbuda | 22,709 | 2018 | |
| 190 | Seychelles | 21,660 | 2018 | |
| 191 | Virgin Islands (US) | 21,440 | 2018 | |
| 192 | Aruba | 18,694 | 2018 |