If armpit hair is growing then you have started puberty. This happens any time between about 12 and 15 years. During puberty you will usually have a growth spurt, that is, you will grow taller rather...
at the age of puberty , that is between 8 and 16 , most likely to grow facial hair is at age 13-14 or sometimes even 12 . its when you hit puberty (changes to body)
Arm-pit hair, along with anything else in puberty, varies from person to person. You could not get it until you're 18, that's not likely though. If you have pubic hair, then that mean you have...