Q: How common is hair loss in adult men and women? — N.F., Bronxville, NY

A: The incidence of androgenetic alopecia (common baldness) is quite high for both men and women. By age 50, 50% of men and 30% of women are affected. By age 70, that increases to 80% of men and 60% of women. Fortunately, in spite of significant thinning, women often preserve their hairline and have a diffuse pattern, so their hair loss can be camouflaged for many years.