Physical changes during adolescence
For girls, you might start to see early physical changes from about 10 or 11 years, but they might start as young as 8 years or as old as 13 years. Physical changes around puberty include:
1. breast development
2. changes in body shape and height
3. growth of pubic and body hair
4. the start of periods (menstruation).
For boys, physical changes usually start around 11 or 12 years, but they might start as young as 9 years or as old as 14 years. Physical changes include:
1. growth of the penis and testes (testicles)
2. changes in body shape and height
3. erections with ejaculation
4. growth of body and facial hair
5. change in voice