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Beard growth begins in puberty and does not stop until the middle of the third decade of life. By increasing the testosterone secretion in the body, the number of facial hair also increases sharply, which makes the hair on the face of the boys gradually become thicker and darker.
9 Scientific answers to the important questions that you are embarrassed to ask
Beard growth begins in puberty and does not stop until the middle of the third decade of life. By increasing the testosterone secretion in the body, the number of facial hair also increases sharply, which makes the hair on the face of the boys gradually become thicker and darker.