The growth rate of scalp hair somewhat depends on age (hair tends to grow more slowly with age), sex, and ethnicity. Scalp hair was reported to grow between 0.6 cm and 3.36 cm per month. It is commonly stated that hair grows about 1 cm per month on average however reality is more complex, since not all hair grows at once. The growth rate of hair varies from individual to individual depending on their age, genetic predisposition and countless environmental factors. Once the cycle is complete, it restarts and a new strand of hair begins to form. Each strand of hair on the human body is at its own stage of development. The three stages of hair growth are the anagen, catagen, and telogen phases. Marianne Ernst, a German "Long hair model". This hair will usually grow to several feet before terminating, but many humans develop much longer hair. Most humans develop the longest thickest hair on their scalps and (mostly observed in males) faces. This varied construction gives the hair unique characteristics, serving specific purposes, mainly warmth (redundant in modern humans) and physical protection. The body has different types of hair, including vellus hair and androgenic hair, each with its own type of cellular construction. Each phase has specific characteristics that determine the length of the hair. Hair follows a specific growth cycle with three distinct and concurrent phases: anagen, catagen, and telogen. The protein called keratin makes up hair and stimulates hair growth. Hair is a stratified squamous keratinized epithelium made of multi-layered flat cells whose rope-like filaments provide structure and strength to the hair shaft. The growth of human hair occurs everywhere on the body except for the soles of the feet, the inside of the mouth, the lips, the backs of the ears, the palms of the hands, some external genital areas, the navel, scar tissue, and, apart from eyelashes, the eyelids. For regrowth of hair and hair loss prevention, see management of hair loss.
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