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ur hair stop going at the age of 40

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hair does not stop growing, it grows until you die.

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Hair indeed does not stop growing except for in certain areas (namely the scalp) where at a certain age, usually around late 40s or 50s, the hormone DHT (di-hydro-testosterone) starts to affect the hair follicles and causes them to shrink and die out, thus stopping hair from growing and even falling out.
This phenomenon is widely known as Androgenetic Alopecia or Pattern Baldness. This occurs in both men and women as both produce Testosterone (which eventually gets converted into DHT). However men have higher levels of Testosterone and so they have more severe symptoms of Androgenetic Alopecia.
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15y ago

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