What is a major physical milestone in women?

A major physical milestone for women is the onset of menstruation, known as menarche, which typically occurs between ages 9 and 16. This event marks the beginning of reproductive capability and signifies significant hormonal changes in the body. Menarche is often accompanied by various physical and emotional developments, playing a crucial role in a woman's overall health and fertility. It is an important milestone in the transition from childhood to adulthood.