text: what are the relative growth rates of head hair, eyebrows, eyelashes, body hair, fingernails and toenails?   "the average growth rate for nails is 0.1 mm each day; individual rates depend on age, time of year, activity level, and heredity. fingernails grow faster than toenails. nails also grow more rapidly in the summer than in the winter. nails on a person's dominant hand (right vs. left) grow faster, and men's nails grow more quickly than women's, except possibly during pregnancy and old age. nail growth is affected by disease, hormone imbalance, and the aging process."  hair on your head grows 0.25mm to 0.40 millimeters per day eyebrows grow 0.10mm at about 0.16mm per day eyelash hair is very similar to eyebrow hair aside from being a bit shorter at 7.5mm.    "growth rates. hair growth varies depending on body region. for example, average eyelash/brow growth rates have been reported at 0.16 millimeters (mm) per day, scalp hair at 0.34 to 0.36 mm/day, and beard hair at 0.38 mm/day. growth rates also are affected by age, gender, hair color, and ethnicity. for example, scalp hair in a prepubescent, adolescent, adult, and older adult have been reported at 0.41, 0.30, 0.34, and 0.32 mm/day, respectively (myers and hamilton 1951)."