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I've seen several websites claim the amount of hair cycles a follicle will go through is predetermined at around 25-30 complete cycles. Is there any genetic evidence to validate this claim? How can this even be determined apart from observationally seeing people lose hair as they age?

Here's a link referring to what I'm talking about:

The number of hair growth cycles is limited: our hair will experience about 25 to 30 cycles like this during our lifetime.

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  • $\begingroup$ note that is an individual follicle, we do grow new ones. $\endgroup$
    – John
    Commented Sep 1, 2017 at 13:40
  • $\begingroup$ The link in this question is dead. :( $\endgroup$ Commented Sep 29, 2022 at 8:38

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