ANSWERS: 3
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Usually when they are 12 or 13, then they grow taller; however, it varies due to genetics.
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Your question is a little indefinite; do you mean mature males, semi-mature males, or males of the genus Homo sapiens? Because one begins growing "taller", or at least longer and wider, within an hour after conception, and continues doing so for about eighteen years. But if you mean the growth spurt that affects most adolescents, usually sometime in high school.
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birth.
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