Hair Stop

I was just wondering. The hair all over his body but the head pass to a certian length, and then stop growing. How does he stop growing? Or does it fall once it reaches a certian length? How is it that the hair on the head can be grown to any length, but hair can not?

DNA said in your scalp hair follicles to grow continually. However, DNA from the skin that is not on your scalp hair follicles said to grow to a certain voltage (weight of hairstrand) is felt by the follicle itself. That is why arm hair, for example, growing to a certain length. Just different instructions given to the hair follicles, that's all.

I asked this question months ago
I do not think I got a response

BC pubic yer wouldnt be to the ground?
hahah

they are different types of hair
as if you feel the hair on your arm, and it feels different pubic hair and your head.

Your hair on the head of your case has a mind of its own. Your hair is another body of dead skin cells (gross I know.) It would be sick if your eyebrows grow as your hair.