What is this hair loss pattern?

This man appears to be developing a Class 3 A pattern of balding. I would have to look closely at what is going on down the middle of his head, but I suspect he is thinning, possibly in a Class 5 A pattern, which is where the 3 A pattern goes as it develops. I would have to examine him to know what is going on, as it could be other conditions, other than genetic hair loss.