Based on a comparison of 177 countries in 2019, Namibia ranked the highest in secondary school starting age with 14.0 years followed by South Africa and Tanzania. On the other end of the scale was Turkmenistan with 10.0 years, Myanmar with 10.0 years and Nepal with 10.0 years.
Data for more countries are available at Secondary School Starting Age indicator page.
| Secondary School Starting Age | Unit | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 |
| Afghanistan | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| El Salvador | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| Ethiopia | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| Finland | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| Gambia | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| Guatemala | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| Guinea | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| Mali | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| Mozambique | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| Namibia | years | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | ||||||||||||||||
| Poland | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| Rwanda | years | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | ||||||||||||||||
| South Africa | years | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | ||||||||||||||||
| Tanzania | years | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | ||||||||||||||||
| Zambia | years | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 |
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