It's just genetics.
In other primates, females become bald, not males.
Sorry to say but I still don't think I have an answer to my question. As far as humans go, everything is genetic.
I think I want to know on a biological level what exactly is happening at the crown and fringe of the head for balding to start there. What is happening on a cellular level ? If it is this thing called DHT, why in these areas. I used to think everything in the human body exits by design and has some reason for its existance so what is so particular about those areas on the head for badling to begin there ?