According to U.S. center for disese control(CDC), scalp hair grows at the rate of 1.25 cm (half inch) per month. That means normal persons hair grows 6 inches long in an year. Under normal circumstances human hairs are always growing. This growth of the hair takes place in series of phases collectively known as hair cyles.
In this phase the hair grows about 1 cm every 28 days. Scalp hair stays in this active phase of growth means in anagen for around two to six years.
Hairs in few people doesn’t grow beyond a certain lengh that is because of vary short active phase of the growth. While few of them grow very long because they have a long active phase of growth. The short active growth phase of about 30-45 days explains why hairs of arms, legs, eye lashes & eyebrow are not able to beyond a certain length.
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