The age you got your first period, also called menarche, is one of those milestones people remember forever. It feels loaded with meaning, and for good reason. Hormones, growth, fertility, and the ...

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Anna Lee Beyer writes about mental health, relationships, parenting, and books for Huffington Post, Romper, Slate, Glamour, Parents, and others. A first menstrual cycle usually occurs between the ages ...

A female’s first menstrual period, known as menarche, occurs during puberty. Menstruation indicates that the body is mature enough for reproduction. About 98% of girls begin their periods by age 15.