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What is a good form of address for a male friend who is too old to be 小, too young to be 老, and too humble to be called 大?

I have a male "friend", last name 柯 (kē) who is over 30. From ages 18-30 or so, he went by 小柯, but that seems less and less appropriate as he gets older. Always going by his full name seems overly ...