male pattern baldness

…first category is dominated by male pattern baldness (androgenetic alopecia). By age 50, some 30 to 50 of men have been affected by male pattern baldness, which progresses gradually, beginning with a characteristic recession of the hairline at the front or thinning of the crown hair and proceeding, in extreme…

When male-pattern baldness sets in, in the late 20s or earlier, the follicles affected undergo exactly the same changes as do those that establish the hairline.