| # | Flag | Country | Lower secondary school starting age (years)Lower secondary school starting age (years) | Year |
|---|---|---|---|---|
| 1 | Namibia | 14 | 2018 | |
| 2 | Tanzania | 14 | 2018 | |
| 3 | Zambia | 14 | 2018 | |
| 4 | South Africa | 14 | 2018 | |
| 5 | Mozambique | 13 | 2018 | |
| 6 | Poland | 13 | 2018 | |
| 7 | Maldives | 13 | 2018 | |
| 8 | Mali | 13 | 2018 | |
| 9 | Latvia | 13 | 2018 | |
| 10 | Denmark | 13 | 2018 | |
| 11 | Papua New Guinea | 13 | 2018 | |
| 12 | Norway | 13 | 2018 | |
| 13 | Lesotho | 13 | 2018 | |
| 14 | Bhutan | 13 | 2018 | |
| 15 | Estonia | 13 | 2018 | |
| 16 | Botswana | 13 | 2018 | |
| 17 | Iceland | 13 | 2018 | |
| 18 | Niger | 13 | 2018 | |
| 19 | Ethiopia | 13 | 2018 | |
| 20 | Finland | 13 | 2018 | |
| 21 | Swaziland | 13 | 2018 | |
| 22 | Republic of Ireland | 13 | 2018 | |
| 23 | Indonesia | 13 | 2018 | |
| 24 | Guatemala | 13 | 2018 | |
| 25 | El Salvador | 13 | 2018 | |
| 26 | Sweden | 13 | 2018 | |
| 27 | Afghanistan | 13 | 2018 | |
| 28 | Gambia | 13 | 2018 | |
| 29 | Guinea | 13 | 2018 | |
| 30 | Equatorial Guinea | 13 | 2018 | |
| 31 | Zimbabwe | 13 | 2018 | |
| 32 | Switzerland | 13 | 2018 | |
| 33 | Rwanda | 13 | 2018 | |
| 34 | Uganda | 13 | 2018 | |
| 35 | Burundi | 13 | 2018 | |
| 36 | Curacao | 12 | 2018 | |
| 37 | Antigua and Barbuda | 12 | 2018 | |
| 38 | Angola | 12 | 2018 | |
| 39 | Argentina | 12 | 2018 | |
| 40 | Australia | 12 | 2018 | |
| 41 | Aruba | 12 | 2018 | |
| 42 | Belgium | 12 | 2018 | |
| 43 | Burkina Faso | 12 | 2018 | |
| 44 | Bahrain | 12 | 2018 | |
| 45 | Benin | 12 | 2018 | |
| 46 | Brunei | 12 | 2018 | |
| 47 | Bolivia | 12 | 2018 | |
| 48 | Canada | 12 | 2018 | |
| 49 | Democratic Republic Of Congo | 12 | 2018 | |
| 50 | Central African Republic | 12 | 2018 | |
| 51 | Republic of the Congo | 12 | 2018 | |
| 52 | Ivory Coast | 12 | 2018 | |
| 53 | Chile | 12 | 2018 | |
| 54 | Cameroon | 12 | 2018 | |
| 55 | China | 12 | 2018 | |
| 56 | Costa Rica | 12 | 2018 | |
| 57 | Cuba | 12 | 2018 | |
| 58 | Cape Verde | 12 | 2018 | |
| 59 | Cyprus | 12 | 2018 | |
| 60 | Dominica | 12 | 2018 | |
| 61 | Dominican Republic | 12 | 2018 | |
| 62 | Ecuador | 12 | 2018 | |
| 63 | Egypt | 12 | 2018 | |
| 64 | Spain | 12 | 2018 | |
| 65 | Fiji | 12 | 2018 | |
| 66 | Federated States of Micronesia | 12 | 2018 | |
| 67 | Grenada | 12 | 2018 | |
| 68 | Georgia | 12 | 2018 | |
| 69 | Ghana | 12 | 2018 | |
| 70 | Greece | 12 | 2018 | |
| 71 | Comoros | 12 | 2018 | |
| 72 | Saint Kitts And Nevis | 12 | 2018 | |
| 73 | South Korea | 12 | 2018 | |
| 74 | Lebanon | 12 | 2018 | |
| 75 | Saint Lucia | 12 | 2018 | |
| 76 | Liechtenstein | 12 | 2018 | |
| 77 | Liberia | 12 | 2018 | |
| 78 | Luxembourg | 12 | 2018 | |
| 79 | Libya | 12 | 2018 | |
| 80 | Morocco | 12 | 2018 | |
| 81 | Macao | 12 | 2018 | |
| 82 | Mauritania | 12 | 2018 | |
| 83 | Malawi | 12 | 2018 | |
| 84 | Mexico | 12 | 2018 | |
| 85 | Malaysia | 12 | 2018 | |
| 86 | Nigeria | 12 | 2018 | |
| 87 | Nicaragua | 12 | 2018 | |
| 88 | Netherlands | 12 | 2018 | |
| 89 | Nauru | 12 | 2018 | |
| 90 | Oman | 12 | 2018 | |
| 91 | Panama | 12 | 2018 | |
| 92 | Peru | 12 | 2018 | |
| 93 | Philippines | 12 | 2018 | |
| 94 | Puerto Rico | 12 | 2018 | |
| 95 | Portugal | 12 | 2018 | |
| 96 | Palau | 12 | 2018 | |
| 97 | Paraguay | 12 | 2018 | |
| 98 | Qatar | 12 | 2018 | |
| 99 | Saudi Arabia | 12 | 2018 | |
| 100 | Solomon Islands | 12 | 2018 | |
| 101 | Seychelles | 12 | 2018 | |
| 102 | Sudan | 12 | 2018 | |
| 103 | Singapore | 12 | 2018 | |
| 104 | Slovenia | 12 | 2018 | |
| 105 | Sierra Leone | 12 | 2018 | |
| 106 | Senegal | 12 | 2018 | |
| 107 | Suriname | 12 | 2018 | |
| 108 | São Tomé and Príncipe | 12 | 2018 | |
| 109 | Syria | 12 | 2018 | |
| 110 | Turks And Caicos Islands | 12 | 2018 | |
| 111 | Chad | 12 | 2018 | |
| 112 | Togo | 12 | 2018 | |
| 113 | Thailand | 12 | 2018 | |
| 114 | East Timor | 12 | 2018 | |
| 115 | Tunisia | 12 | 2018 | |
| 116 | Tonga | 12 | 2018 | |
| 117 | Trinidad and Tobago | 12 | 2018 | |
| 118 | Tuvalu | 12 | 2018 | |
| 119 | United States | 12 | 2018 | |
| 120 | Uruguay | 12 | 2018 | |
| 121 | Saint Vincent and the Grenadines | 12 | 2018 | |
| 122 | Venezuela | 12 | 2018 | |
| 123 | Virgin Islands (British) | 12 | 2018 | |
| 124 | Vanuatu | 12 | 2018 | |
| 125 | Yemen | 12 | 2018 | |
| 126 | South Sudan | 12 | 2018 | |
| 127 | Marshall Islands | 12 | 2018 | |
| 128 | Virgin Islands (US) | 12 | 2018 | |
| 129 | American Samoa | 12 | 2018 | |
| 130 | Sint Maarten | 12 | 2018 | |
| 131 | Andorra | 12 | 2018 | |
| 132 | Guinea-Bissau | 12 | 2018 | |
| 133 | Guyana | 12 | 2018 | |
| 134 | Hong Kong | 12 | 2018 | |
| 135 | Honduras | 12 | 2018 | |
| 136 | Haiti | 12 | 2018 | |
| 137 | Israel | 12 | 2018 | |
| 138 | Iraq | 12 | 2018 | |
| 139 | Iran | 12 | 2018 | |
| 140 | Jamaica | 12 | 2018 | |
| 141 | Jordan | 12 | 2018 | |
| 142 | Japan | 12 | 2018 | |
| 143 | Kenya | 12 | 2018 | |
| 144 | Cambodia | 12 | 2018 | |
| 145 | Kiribati | 12 | 2018 | |
| 146 | New Caledonia | 11 | 2018 | |
| 147 | Montenegro | 11 | 2018 | |
| 148 | Madagascar | 11 | 2018 | |
| 149 | Republic of Macedonia | 11 | 2018 | |
| 150 | Mongolia | 11 | 2018 | |
| 151 | Bulgaria | 11 | 2018 | |
| 152 | Malta | 11 | 2018 | |
| 153 | Mauritius | 11 | 2018 | |
| 154 | Czech Republic | 11 | 2018 | |
| 155 | Vietnam | 11 | 2018 | |
| 156 | Tajikistan | 11 | 2018 | |
| 157 | Colombia | 11 | 2018 | |
| 158 | Belize | 11 | 2018 | |
| 159 | United Kingdom | 11 | 2018 | |
| 160 | Bangladesh | 11 | 2018 | |
| 161 | Albania | 11 | 2018 | |
| 162 | Croatia | 11 | 2018 | |
| 163 | The Bahamas | 11 | 2018 | |
| 164 | Hungary | 11 | 2018 | |
| 165 | Gabon | 11 | 2018 | |
| 166 | France | 11 | 2018 | |
| 167 | India | 11 | 2018 | |
| 168 | New Zealand | 11 | 2018 | |
| 169 | Eritrea | 11 | 2018 | |
| 170 | Italy | 11 | 2018 | |
| 171 | Uzbekistan | 11 | 2018 | |
| 172 | San Marino | 11 | 2018 | |
| 173 | Samoa | 11 | 2018 | |
| 174 | French Polynesia | 11 | 2018 | |
| 175 | Kyrgyzstan | 11 | 2018 | |
| 176 | Brazil | 11 | 2018 | |
| 177 | Bermuda | 11 | 2018 | |
| 178 | North Korea | 11 | 2018 | |
| 179 | United Arab Emirates | 11 | 2018 | |
| 180 | Kuwait | 11 | 2018 | |
| 181 | Cayman Islands | 11 | 2018 | |
| 182 | Kazakhstan | 11 | 2018 | |
| 183 | Laos | 11 | 2018 | |
| 184 | Barbados | 11 | 2018 | |
| 185 | Bosnia and Herzegovina | 11 | 2018 | |
| 186 | Algeria | 11 | 2018 | |
| 187 | Lithuania | 11 | 2018 | |
| 188 | Romania | 11 | 2018 | |
| 189 | Djibouti | 11 | 2018 | |
| 190 | Serbia | 11 | 2018 | |
| 191 | Russia | 11 | 2018 | |
| 192 | Monaco | 11 | 2018 | |
| 193 | Moldova | 11 | 2018 | |
| 194 | Belarus | 10 | 2018 | |
| 195 | Pakistan | 10 | 2018 | |
| 196 | Austria | 10 | 2018 | |
| 197 | Turkmenistan | 10 | 2018 | |
| 198 | Armenia | 10 | 2018 | |
| 199 | Germany | 10 | 2018 | |
| 200 | Sri Lanka | 10 | 2018 | |
| 201 | Azerbaijan | 10 | 2018 | |
| 202 | Myanmar | 10 | 2018 | |
| 203 | Nepal | 10 | 2018 | |
| 204 | Ukraine | 10 | 2018 | |
| 205 | Slovakia | 10 | 2018 | |
| 206 | Turkey | 10 | 2018 |