Puberty is a period of several years in which rapid
physical growth and psychological changes occur,
culminating in sexual maturity. The average onset
of puberty is at 10 for girls and age 12 for boys.
Every person's individual timetable for puberty
is influenced primarily by heredity, although environmental
factors, such as diet and exercise, also exert some
influence. These factors can also contribute to
precocious puberty and delayed puberty...