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Puberty is defined as a period of rapid growth and sexual change that occurs in early adolescence and produces a person of adult size shape, and sexual potential.
Normal development rates are an approximate average age and actual age can very as much as three years.
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Normal Development Rate |
Jennifer's Development Rate |
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Boys |
Age |
Girls |
Age | |
| Testes increase production of testosterone | 10 | Ovaries increase production of estrogen and progesterone | 9 | Age 9 3rd Grade |
| Testes and scrotum grow larger | 11 | Uterus and vagina begin to grow larger | 9.5 | Age 9 3rd Grade |
| Pubic hair begins to appear | 12 | Breast "bud" stage | 10 | Age 9 3rd grade |
| Penis growth begins | 12.5 | Pubic hair begins to appear | 11 | Age 11 5th grade |
| Spermarche (first ejaculation) | 13 | Weight spurt begins | 11.5 | Age 9 3rd grade |
| Weight spurt begins | 13 | Peak height spurt | 12 | Age 12 6th grade |
| Peak height spurt | 14 | Menarche (first menstrual period) | 12.5 | Age 11 5th grade |
| Peak muscle and organ growth (also, shoulders become noticeable broader) | 14.5 | Peak muscle and organ growth (also, hips become noticeably wider) | 12.5 | Age 12 6th grade |
| Voice lowers | 15 | First ovulation | 13.5 | Age 11 5th grade |
| Readily visible facial hair | 16 | Final pubic-hair pattern | 15 | Age 13 7th grade |
| Final Pubic-hair pattern | 18 | Full breast growth | 16 | Age 16 10th grade |
