The average age of menarche (first period) is 13 years old - but anything between 8 years old and 18 years old is still very normal. Everyone reaches menarche at a different age, if you're going through puberty then menarche normally happens within four years.
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Most girls begin to menstruate between the ages of 11 and 14, but the age can vary widely. Some girls may start as early as 9 or as late as 16. If a girl has not started menstruating by age 16, it is a good idea to consult a healthcare provider for evaluation.