normally when your between 10-14 years of age
well i would say between 11-13 years old
between ages 9-16 are when most girls will start.
The average age of menarche is 13 years old, but anything between 8-18 is normal.
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usually , you start when your mom did .
Answer: Some as early as 10 but others may not start until 15 or 16. The average age is about 13-14.