Definitions
1.NounAn alumnus, especially of a public school.
2.NounA former member of a group.
3.NounA man with an established network of friends who assist one another in social and business situations; a good old boy.
4.NounAn elderly man."I got talking to an old boy in the pub, and he told me what the village used to be like in the old days."
5.NounA familiar term of address for a man of any age."Listen, old boy, I've got some news."