system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do men go bald but women don’t?
gpt
Hair follicles are sensitive to dihydrotestosterone (DHT) which men produce at much higher levels.  Two consequences of that: men grow more body hair, in more places, and after years of exposure to DHT, mens' hair follicles start to inactivate, especially on the scalp.

Hair grows in cycles, with each follicle producing hair for a while, then pausing for a break.  Over years, DHT accumulates in the follicles, and in high amounts it starts to screw up the cycles - the follicle spends more and more time at rest and eventually becomes unproductive.