It helps keep our fingers warm.
Stops boogers getting away - lol
Gravity !! It pulls the hair from the top of your head and out of your nose ,ears and eye brows. In time we all will show effects of Gravity ( walking bent over,sagging breasts, etc.). LOL
You'll find out soon enough, friend.
The hairs just get too tired to get all the way up to the top of the head after a while.
Because thats the hair that used to grow on our head.
its there to keep their "oh im saving that for later" just like their beards