Why do men’s eyebrows, nose hair, and ear hair grow when they get older?
The hormones, that cause the pattern of thinning and hair loss in the scalp, also cause the mass of Vellus Hairs that. These are naturally present in the nose and ears to grow darker, longer and grow coarser. It is believed that the increased growth of hair on the nose and ears among aging men is tied to the same causes as male patterned baldness. The different reactions within the different hair follicles relate to the way men develop secondary sexual characteristics (which is usually governed by the levels of hormones in the body). So while the testosterone can result in the loss of scalp hair, it can lengthen and coarse the hair on other parts of the body.
Everyone has hair in their noses and ears, of course; the hairs act as “dirt filters” protecting very sensitive areas from dust and pollutants. As we age, though, these hairs tend to poke out from their hiding spots to see what’s going on in the real world.
Another article you mind find interesting with male hair patterns is: What is the evolutionary reason for men losing their hair?
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