Androgenetic Alopecia

Androgenetic alopecia (AGA) was identified as the most common cause of hair loss, affecting both men and women, though it was more noticeable in men. By age 30, approximately 30% of white males were affected, increasing to 50% by age 50. AGA occurred across all races but was less common in Asians and African-American males, with white males being four times more likely than black males to develop advanced AGA. The pattern of hair loss differed by sex, with men experiencing temporal and vertex balding, while women experienced mid-frontal scalp thinning. Notably, 57% of women over 80 were affected by female pattern hair loss.