>>/22836/
Basically, on the new the new earth, hair folacles will just grow the same pigment color as their peak strength, forever peak. They don't weaken, and thus the color never changes.

When a folacle can die, it's strength of color pigment dies first.
For blonde, this looks like your hair changes pigment from gleeming golden to browns and oranges, and then to grey. And finally, white (the folacle can no longer grow hair color). Then, if the folacle is RIP, not even hair.

I don't know wordings but this do be how it is, ye.