Based on a comparison of 177 countries in 2021, Tanzania ranked the highest in secondary school starting age with 14.0 years followed by South Africa and Zambia. On the other end of the scale was Turkey with 10.0 years, Sri Lanka with 10.0 years and Palestine with 10.0 years.
Data for more countries are available at Secondary School Starting Age indicator page.
| Secondary School Starting Age | Unit | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 |
| Afghanistan | 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 | ||||||||||||||||
| Maldives | 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 | ||||||||||||||||
| Niger | 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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