If we’re sprouting new hairs from the empty follicles, and the new guys grow at the same rate as the others, they’d take forever to catch up to the length of the rest of your hair. Make it make sense, please.
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For starters, a hundred hairs is not a lot when you consider how many are on your head. You have roughly a hundred thousand. So you are losing 1/1000 of your hair every day.
You are correct that the new ones grow at the same rate, so for those hundred you just lost, you gained a hundred more and broke even.
The reason it’s not noticeable is because those hairs come from all over your head, not from one place. In other words, it’s not falling out in clumps, but in single strands. It would be like plucking a hundred blades of grass out of a field, but spread across the whole field. You wouldn’t notice it at all.
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