The thickness of hair

The thin or thickness of hair depend on the fertility and amount of folikels in the head skin. When a child is born, the folikels is about 1.135/cm² of head skin. At age 3 – 12 months the folikels become 795/cm² of head skin, at the age 30 the folikels becomes 615/cm², and at the age 70 – 80 the amount of folikels become 435/cm² of head skin.