Old boy, chap, man, etc.
Definition 1 of 4

Familiar Tone
Used among friends or people comfortable with each other, indicates close relationship or warm feelings.

Don't worry, old boy, I've got your back!
Old-fashioned Charm
Has an old-timey feel that can add a playful, nostalgic, or respectful tone to a conversation.

You're a true gentleman, old boy!
Not Literally Old
It doesn't mean the person is old in age; it's just a friendly way to address someone.

How's it going, old boy?
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