follicle growth rates by age and body region
Below is a brief table of hair growth rates defined for people
of different age and by the region of the body where the growth
rate analysis was made (after Myers 1951). Typically, females will
have slightly faster growing scalp hair than males of the same age
but slower growing hair elsewhere such as on the leg.
||Daily growth rate for scalp hair (mm)
||Daily growth rate for eyebrow hair (mm)
||Daily growth rate for thigh hair (mm)
Thus the long hairs of the scalp have the fastest rate of hair
growth whereas the short hairs as in the eyebrow have the slowest
follicle regeneration after plucking by body region
Below is a brief table showing the number of days it took for
a hair follicle from which a hair was plucked to regenerate a new
||Regeneration rate for scalp hair (days)
||Regeneration rate for eyebrow hair (days)
||Regeneration rate for thigh hair (days)
The average number of days required for regeneration of hairs in
90% of the follicles from which hairs were plucked was 129 in the
crown of the scalp, 123 in the under arm, 121 in the thigh, 92 in
the chin, and 64 in the eyebrow. Hairs of the scalp regenerate more
quickly for males than females, but hairs of the under arm, and
thigh regenerate more quickly in females than males. Regions in
which hairs are long and grow at the fastest rate require the longest
interval for regeneration.
follicle growth rates references
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Different growth rates of pigmented and white hair in the beard:
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Reduced linear hair growth rates of vellus and of terminal hairs
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