He left school at the age of 16.

他16岁便离开学校。

《牛津词典》

He left school with no formal qualifications.

他离开学校没有获得正式学历。

《牛津词典》

youdao

At the age of fifteen, he left school and went to work in the music business.

VOA: special.2009.02.08

He'd left school for a couple of years.

他离开学校有些年了。

麻省理工公开课 - 固态化学导论课程节选

He left school at the age of fourteen.

VOA: special.2010.05.21

He left school after the ninth grade and said he has poor reading skills.

NPR: Neighbor Sours On Property Sale To Vt. Governor

He left school without qualifications when he was expelled for attacking a teacher with a chair.

BBC: NEWS | UK | England | London | Killer's chaotic life laid bare

He recalled reciting the Pledge of Allegiance as a child, before he left school in the ninth grade.

NPR: Neighbor Sours On Property Sale To Vt. Governor