To my understanding, the hairline phenomenon is reversable. You can easily stop having one if the male pattern baldness strikes you hard. Whoever has a hairline can hope.
I take 1/4 proscar and i think my hairline is improving. There a bunch of short dark hairs growing in on the edge and a few popping up further down. I doubt you'll recover inches of your hairline but a cm wouldn't be impossible.
i have dark pigmented vellus hairs 2cm just below my current hairline. i hope those hairs will regrow back to normal terminal hair. they have been getting darker and more visible by the day.
