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Presenile graying is the process of a gradual change in hair color in older people from light to gray. Usually this process occurs after a person reaches middle age, that is, after 35-40 years. Old people, women caring for children and husbands, as well as people with diseases of the thyroid gland or adrenal glands most often begin to think about graying. This process is also typical for many professions that involve working in the sun. It is believed that graying is a natural process of aging of the body. Depending on how quickly your skin ages, your hair color may change from lighter to darker as you age. This process can be caused by various factors, such as genetic predisposition, melanin levels in the skin, season, diet, lifestyle, etc. However, there is still no clear answer to the question of why graying occurs and what factors influence its speed.