u/Hot_Sand_8486

Sort of a silly question, so don't pay it too much mind. But I've been studying Brazilian Portuguese while writing a character somewhat similar to Jay from The Great Gatsby, who tends to use 'old sport' as a term of endearment.

This has prompted me to wonder, how might you translate that, or what would be a similar phrase that captures that old, wealthy sort of venacular? The best Google has come up with for me is 'meu velho', which I don't hate, but I wonder if we could do better than that.