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Hair Growth FactorJust like there are changes to the body and skin, your hair's structure and its appearance also change as you grow older. Hair Growth in BabiesBabies are born with a specific, genetically determined number of hair follicles. Yet some babies have hardly any hair at birth, while others have quite a bit. This is no indication of what the state of their hair will be later in life! Hair Growth in Small Children'sSmall children's hair often has characteristics that are lost later in life. For example, blonde hair may darken as they grow older and curls may disappear. The thickness of children's hair increases fast until the age of three or four. The diameter continues to increase more slowly until the age of 10 or 11, when the hair should be at its thickest. Hair Growth at PubertyIn puberty, the body undergoes a number of metabolic changes. These also affect the hair. The sebaceous glands are stimulated, often secreting an excess of oil and resulting in oily hair. Dandruff can also appear at this stage, the result of oil secretion and hormonal changes. Around the age of 25, the diameter of hair starts to decrease. In the next 15 years the hair-growth cycle changes, with fewer hairs in the anagen phase and more in the resting phase. Hair growth thus slows down. Greying of Hair PhaseThe age at which grey hairs start appearing is genetically determined. Hair turns white when melanin is no longer produced. Individual hairs become thinner. Many men start losing their hair, and a percentage of women experiences some thinning. |
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