The lifetime of hair

Hairs are said to grow 0.3 to 0.4 millimeter each day. Women’s hair grows faster than men’s. How fast each person’s hair grows is also different by his or her age. Additionally, it also is found that hair grows faster in summer than in winter. Average length of a hair cycle, a period that begins when a hair is born and lasts until it falls out, is 3 to 5 years for men and 4 to 6 years for women. Exceptional cases have been reported, however, in which hair continued growing for 10 years up to 2 m.