Testosterone works on many parts of the body. After awhile, the penis also gets thicker. Soon after pubic hair begins, the penis starts to grow. ![]() After some time the hair starts to curl and begins to spread in a triangle-like pattern. At first it will be a few straight hairs. The first thing you will probably notice is pubic hair growth. The first thing your healthcare provider may notice is an increase in the size of the testicles. The physical changes usually take 3 to 4 years to be completed. However, it can begin anywhere between 9 and 15 years. The average age that boys start puberty is around 11 and 1/2 years old. ![]() Testosterone is the main hormone that causes most of the changes a young man goes through. These hormones start working on the testicles, causing them to produce testosterone. Hormones in the body are responsible for the changes in your body. It is a time of much physical and emotional growth. Puberty is the time when a boy's body becomes a man's body.
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