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One of the most noticeable signs of puberty in boys is the growth of facial hair. This milestone is often seen as a rite of passage, marking the transition from boyhood to manhood. The timing of when boys start growing facial hair varies greatly and is influenced by a multitude of factors including genetics, hormonal changes, and ethnic background. The Science Behind Facial Hair Growth Facial hair growth is largely driven by the male hormone testosterone, which starts to increase as boys enter puberty. This typically happens between the ages of 12 and 16, but can vary. The first sign...