Based on a comparison of 177 countries in 2018, Namibia ranked the highest in secondary school starting age with 14.0 years followed by Tanzania and South Africa. On the other end of the scale was Turkey with 10.0 years, Slovakia with 10.0 years and Myanmar with 10.0 years.
Data for more countries are available at Secondary School Starting Age indicator page.
| Secondary School Starting Age | Unit | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 |
| 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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