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Hi, I have a question about terminal length. Suppose your hair has reached its terminal length, and you never cut your hair, and then you do something permenant to it that usually grows out (bleaching, dying, etc.) would it end up staying like that forever, like if you bleached your hair would you stay blonde forever? What would happen?
-Grant
I took this from www.choisser.com/longhair it explains about terminal length.
The Life Span of Hair
A human hair only has a life span of two to six years, after which time it falls out and a new hair soon sprouts in its place. This life span, with the growth rate we just discussed, translates into a "terminal length" of one to three feet (30 to 90 cm). Some people are genetically disposed to have longer-living hair than others, and they can therefore grow longer hair. And many people find, as they age, the life span or growth rate of their hair decreases, meaning their terminal length decreases. So each human being, if never cutting any hair, will eventually achieve a maximum hair length, and that length will most likely be between one and three feet (30 to 90 cm). The good news is that whatever length you achieve within that range, you will nevertheless have enough hair to "look like a longhair"!
Of course all of your hair strands will never simultaneously achieve terminal length. At any given time, a guy who has not snipped a hair in decades will have an assortment of young hair strands and older ones
so yes the blond will eventually grow out.
Or "fall out"...
My ex-husband died his hair at terminal length. The dye grew out, but his hair never grew longer. Strange but true...