A new study has found that girls as young as eight or nine years old already have a tendency to notice and respond to numbers ...

Girls who grow up eating a healthier diet than their peers may be less likely to get their first menstrual periods at an earlier age — regardless of height or body mass index — a new study ...

Ahead, the experts share how the age of one’s first period impacts future health. People who start their periods at a younger age have an increased risk for cancer.