It will grow naturally, once you are old enough and reach puberty.
No.
you have to hit puberty
Humans grow armpit hair as a natural way to regulate body temperature and to release pheromones, which are chemicals that can attract potential mates.
Yes you can make your hair in ypour armpits to grow, you must shave it then it will grow back.
sweat
why would u even want to grow armpit hair it is disgusting so dont do it
Guys typically start to grow armpit hair during puberty, which usually occurs between the ages of 9 and 14. The onset of armpit hair growth can vary significantly among individuals, depending on factors like genetics and hormonal changes. Most will have noticeable armpit hair by the age of 15 or 16.
to be honest mines grow about 1 metre long
on your head, armpit area, private parts
proper shaving
um obviously...
Around a month.