Wait but why does it stop? Just because it thins out and breaks off etc.?

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Everyday, you shed hair. As your hair grows longer, more long hairs fall out.

Then it reaches a balance point where the amount of long hair loss counteracts the growth speed of your hair.

I don't think hair ever stops growing. Each hair eventually dies and falls out.

plus, your longest hairs are the oldest, so are more likely to die than younger and shorter hair