Question: how long before your period do you get armpit hair?
Answer: A little later, hair also will grow under your arms. For most girls, their first menstrual period, or menarche (say: MEH-nar-kee), begins about 2 years after she first starts to get breasts. For most girls this is around age 12. But it can be as early as age 8 or as late as 15.