You have a norwood 3 A type loss ..no need to take propecia for years to reverse the loss.
I advise you to have a FUE operation of 3000- 3500 grafts (I mean approx. 8000-9000 hair shaft ) to cover all vertex area , create a new hair line in one session of...
Once the hair changes its pigmentation characteristics, it does not revert back. If you like to change the color of your hair, you need to use hair dye.