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Thinning hair, hair loss, and other hair-related issues can affect people as young as in their teens and early twenties. 人们在青少年和20岁出头时，就有可能遇到头发变少、脱发，以及其他头发相关的问题。 In fact, an estimated 40 percent of men will have noticeable hair loss by age 35, and an estimated 40 percent of women will have visible hair loss by the time they are 40. 数据显示，约40%的男性到35岁时，发量明显减少。40%的女性到40岁时，发量明显减少。 所以，90后光头强已上线，花季少女们也悄悄打响了“发际线保卫战”。 | 
