old boy

nouns

a familiar term of address for a man
old boy, old man
a vivacious elderly man
old boy
is a type of (narrower)
an elderly person
golden ager, old person, oldster, senior citizen
a former male pupil of a school
old boy
is a type of (narrower)
a person who has received a degree from a school (high school or college or university)
alum, alumna, alumnus, grad, graduate