system
Given the following post, respond as if you're commenting on Reddit:
human
Why does our ear and nose hair grow longer as we age?

As I hit middle age, I noticed mine growing faster.  My father (in his 80s) has significantly more than I do. Is there a present, former or future necessity for it? Does it have a length 'limit' encoded within us?
gpt
Its not that they're growing longer per se, they're growing for more time.  The reason your arm, leg, ear, nose, etc. hair seems to stop growing once it hits a certain point has to do with how often there is overturning in your hair follicles.  As we age, the turnover time increases, that is the peaks and valleys (growing and empty) spread out.  For some, they become stuck permanently in the valley between production of hair strands -- this is baldness.