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Generally speaking an increase in muscle mass tends to be one of the later stages of puberty. Puberty can start at any age from 9 years old right up until the later teens. It usually it usually starts at around 12 or 13 years of age. Puberty lasts on average for around 6 years and muscle mass tends to increase towards the end of this period. So for a boy who started puberty aged 12 you might probably expect to see an noticable increase in muscle mass at around 16 or 17 years of age. Remember though that averages are just mathematical statistics and in the real world some boys might develop an increase in muscle mass sooner or later than the "average."

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Q: How old is a guy when he starts to hit the stage of puberty where he gains muscle mass?
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