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Why is my hair so thin at 40?: Understanding and Managing Midlife Hair Changes

According to the American Academy of Dermatology, androgenetic alopecia affects up to 30 million women and 50 million men in the U.S., with many experiencing noticeable thinning around age 40. Understanding the complex factors behind this common condition is the first step toward managing it effectively, answering the question: **Why is my hair so thin at 40?**