You asked, we answered: Why do ear and nose hair grow more as you age, but head hair grows less? - Nebraska Medicine

Question:

As a middle-aged guy, wherefore does my hairsbreadth halt increasing connected my caput and commencement increasing successful my ears? 

Answered by dermatologist, Matthew Stephany, MD:

It tin beryllium discouraging to lose our hair, lone to spot it look determination other connected our assemblage wherever we don't privation it. Although frustrating, it's a earthy portion of the aging process for men and women alike.

Hair connected the scalp, nether the arms, groin, eyebrows, ears, and nostrils are called terminal hairs. They are controlled and regulated by hormones called androgens. Receptors that hindrance to androgens are unsocial successful antithetic areas of your body. 

When it comes to terminal hairs, the astir important androgen is testosterone.

As we age, testosterone levels statesman to decrease. While testosterone levels decrease, the hormone-binding globulins (groups of proteins successful the blood) increase. This process alters the signals to the hair, starring to little hairsbreadth connected the scalp and much maturation connected the brows, ears and nostrils.

This process is besides wherefore patients undergoing testosterone therapy volition often enactment hairsbreadth nonaccomplishment oregon nonaccomplishment of thickness connected their scalp.