Question

Have they developed new parts as they grow bigger ?​

Answer 1

Answer:

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Answer 2

Answer:

Boys tend to show the first physical changes of puberty between the ages of 10 and 16. They tend to grow most quickly between ages 12 and 15. The growth spurt of boys is, on average, about 2 years later than that of girls. By age 16, most boys have stopped growing, but their muscles will continue to develop.