Yes, a girl can get her period at 9 years old.
While the typical age range for a girl to start menstruating is between 8 and 17, according to the provided reference, it is possible for a girl to begin menstruating at 9. The reference states, "Your periods will start when your body is ready. This is usually between age 8 and 17, or 2 years after your first signs of puberty." This indicates that the lower end of the typical range includes age 8, so age 9 falls within the expected timeframe. The timing of when a girl begins menstruating is based on when their body is ready.
Factors influencing the start of menstruation can include genetics, nutrition, and overall health. If a girl shows signs of puberty before age 8, it is considered precocious puberty, and a doctor should be consulted.
