what determines hair length
Hair length is completely controlled by the length of the anagen phase of your hair follicle. How long this period lasts is generally determined mostly by genetics, but can also be affected by hormones, and even extreme stress.or the hair on your head, the average length of the anagen phase is about 2-7 years. For your arms, legs, eyebrows, etc., this phase usually lasts just 30-45 days.