Menarche: The age of thelarche (breast development) and menarche (onset of ovulation and periods) has dropped in this country to around age 10 or so. However, there are a variety of factors that cause the onset including genetic, body fat, diet, etc. If you are really worried, see your family doctor. However, menarch isn't considered late until age 16.
Answered 4/15/2019
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Hard to say: Any girl who has not had at least nipple/breast development by age 14 is considered delayed and deserves a full evaluation. Menses is usually around 2 years after early breast development. Your primary doc could start some testing while they arrange for her to see a pediatric endocrinologist.
Answered 7/29/2017
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