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.

The age of one's first period can predict their health in the future. (lastudio87 / Getty Images) For girls, starting their period is inevitable. But the age when a child’s period begins, called ...

Add Yahoo as a preferred source to see more of our stories on Google. A new study out of Brazil links early or late menstruation onset to health struggles later in life. How the timing of your first ...

Your menstrual cycle is the time between the first day of your last period and the first day of your next period. Most menstrual cycles are 24 to 38 days. When you have a cycle that’s less than 24 ...

More than 65 percent of women ages 15 to 49 in the United States use some form of birth control, and many of them are on hormonal birth control methods like the pill, patch, ring, implant, injections, ...

For girls, starting their period is inevitable. But the age when a child’s period begins, called menarche, can tell them a little about their health later in life. Menarche that begins “anytime ...