Why is hair loss irregular with age?

I just don’t understand why the earlier someone starts balding doesn’t always mean they bald extremely quickly. Like what explains a 30 year old balding almost completely in 2 years vs a 20 year old who starts balding at 20 but takes 15 years to show significant loss? Again, it is tied to the genetics. Each hair in a region has a finite number of hair cycles to it. when the hairs go through its...

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