old boy/girl

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old ˈboy/ˈgirl

(informal)
1 an older man/woman: There’s a nice old boy living next door.
2 a former pupil of a school: He’s one of our most famous old boys.We have an old girls’ reunion every five years.
See also: boy, girl, old

old girl

n. an old lady; a lively old lady. What makes an old girl like that so feisty?
See also: girl, old