It all depends on who you are, sometimes your period comes before arm pit hair even, sometimes it also depends on when your mom had it, if your mom had it early then chances are you will to and vice versa.
He has. He has long armpit hair
The longest person in the world that has the longest armpit hair was Iwokasha Ban from Iraq who had arm pit hair like an ungroomed.
Less time than the hair on your head. hair is hair.
Around a month.
to be honest mines grow about 1 metre long
Don't worry.It's coming very soon,along with a few other physical changes you may notice.
It just depends on the person
It remains reliably testable for six months in ALL body hair.
if your breast is getting hard you should get a breast exam. Your pubic hair should be about 1 or 2 inches long and very dark, curley, and in a triangular shape. your armpit hair should be at a length were you need to shave it.
It is not about how old you need to be but how far you have grown into Puberty. Puberty is the stage when armpit hair and pubic hair begins. Each child is different so age has little bearing on it, although puberty can begin around 10 years old for girls and 12 years old for boys so not long after.
It will grow back slower...but it's not permenant. DUHHH.
By 18 he should have long had pubic and armpit hair. He may still have some growth in him but that is about over. Kinda scary you know his penis size.