DHT, type of testosterone. It accumulates in the scalp of the head and destroying hair follicles. The older the man becomes, the more DHT is produced. Or let’s say it is normal distribution during the life of a man.
Not all men have enough of DHT in their body or receptors in their scalp.. So it varies.
There is a good subreddit r/tressless for this topic.
While women can have the same receptors but not enough of DHT.
Proof that DHT is responsible can be seen with trans people. F to M tend to lose hair. Or M to F, their testosterone is supresed; they tend to get their hair back.
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