old boy
noun
1
- a former male pupil of a school, college, or university男校友。
1.1
- a former male member of a sports team, company, or other organization（男性）老队友; 老同事。
2
- informal an elderly man〈非正式〉老头。
2.1
- an affectionate form of address to a boy or man（对男孩或男人的爱称）老伙计; 老朋友。