For the girls who are wondering what happens to boys during puberty. Ok so. In boys, puberty usually starts around age 11. The testicles and skin around the testicles begin to get bigger. Also, early stages of pubic hair forms on the base of the penis. But physical changes in boys usually start around age 13. For example: Penis gets longer as testicles continue to grow bigger. Some breast tissue may start to form under the nipples (this happens to some teenage boys during development and usually goes away within a couple of years). Boys begin to have s3x dreams and the penis ejects most of the time. The voice begins to change, it may “crack,” going from high to lower pitches (man its sooo annoying.) Muscles get larger. I had to search this up but boys grow 2-4 inches per year. But I grew 5 inches in 3 months. In boys, stage 4 usually starts around age 14. For example: Testicles, penis, and scrotum continue to get bigger, and the scrotum will get darker in color. Armpit hair starts to grow. Deeper voice becomes permanent. Acne may start to appear. In boys, stage 5 usually starts around age 15. For example:Penis, testicles, and scrotum will have reached adult size. Pubic hair has filled in and spread to the inner thighs. Facial hair will start coming in and some boys will need to begin shaving. Growth in height will slow down, but muscles may still be growing.