Andrew Huberman· PhD
Hair loss is not occurring between the 49th and 50th birthday. Hair loss is ongoing from about age 30 to age 50. It's only by age 50, however, that about 50% of people out there start to notice that hair loss.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
Hair loss is not occurring between the 49th and 50th birthday. Hair loss is ongoing from about age 30 to age 50. It's only by age 50, however, that about 50% of people out there start to notice that hair loss.
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What we know is that by age 50, approximately 50% of all men and women will have experienced significant enough hair loss that they start to notice it.
but again that doesn't become cosmetically presentable and cosmetically noticeable until you've lost 30 40 50 of that hair density