This is kind of hard to answer because each person matures at a different age some are as early as 12 and some are as late as 17 or 18 (can be later) it is usually determined by your parents and your ancestors, or relatives (people that are related to you by blood). But the norm would be like 15 or 16 or maby just a little sooner but everyone is different. Also another thing to know is that some people don't stop growing until they are 25 which means once you do reach physical maturity you are still growing more and more.
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