The prevalence of pattern hair loss may be as high as 98% and as low as 40%, depending on the study definitions.[2][4][5][6] In men, the age of onset usually is between 20 and 25 years, and prevalence and severity of disease increase with age. In general, 30% of white people are affected by age 30 years, 50% by age 50 years, and 80% by age 70 years. The global incidence varies among ethnic groups with the greatest incidence in white people, followed by Asians, African Americans, and Native Americans.[5][6][7] In women, the onset of hair loss is usually before 40 years, and over 10% of premenopausal women have some evidence of pattern hair loss.[3][8][9][10]com.bmj.content.model.Caption@1b6acd81[Figure caption and citation for the preceding image starts]: Female-pattern androgenetic alopeciaFrom the collection of Robert Haber, MD [Citation ends]. However, the incidence increases in women around the time of the menopause and may affect up to 56% of women over the age of 70 years.[8]

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