Testosterone is the main hormone responsible for the changes in boys.
It's completely normal for you to experience puberty at any point between the ages of 8 and 14, and these are some of the changes you may notice.
1. Shoulders get wider
Your body is filling out and changing shape during puberty, so you’ll notice your shoulders become wider.
2. Muscles get bigger and stronger
Your muscle mass is also building during puberty, so you’ll notice your muscles grow and strength improve, particularly your upper body strength.
3. Voice starts to change
Your voice will ‘break’ as you go through puberty and will become permanently deeper.
During this process, you might find that your voice is very deep one minute and then goes very high the next. This is completely normal.
4. Penis and testicles get larger
Your penis and testicles will grow in size during puberty, and your scrotum will gradually become darker in colour.
5. You may start to get erections
This is when your penis goes hard and ...
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