Getting your **first period —also known as **menarche**—is a natural milestone in puberty. It marks the beginning of your body's menstrual cycle, a healthy process that prepares your body for possible pregnancy later in life. While it can feel exciting, surprising, or a little nerve-wracking, millions of girls go through it every year. With the right information and preparation, you'll feel confident and in control. Recent studies show the average age for a first period in the U.S. is now around **11.9 years**, down slightly from previous generations, though it commonly happens anywhere between ages 10 and 15. Most girls start about two years after their breasts begin developing. If it hasn't arrived by age 15 or comes very early (before 9), it's worth chatting with a doctor, but for most, it's perfectly normal. ### What to Expect: Signs and the First Flow Your body gives clues before your period arrives: - Breast growth and tenderness - Pubic and underarm hair - Cl...