If I have some miniturization at the crown and diffusely all over, this would not be considered a mature hairline would it?
Miniaturization of hair (greater than 20% small or thin shafts) is considered balding, irrespect of its location. A mature hairline begins roughly around 1 finger breath above the tip of your frontalis muscle at the frontal area and about 1 1/2 or 2 fingers breath at both corners. If you have diffuse miniaturization all over your head, consider checking your permanent zone for miniaturized hairs. A condition called Diffuse Unpatterned Alopecia (DUPA) means that you have miniaturization all over your head including the permanent zone in the occipital area. In the classic male pattern baldness, there is less than 20% miniaturization in the permanent zone in men.