The changes in a woman’s sex hormones with age can simply be divided into three phases, which are classified as puberty, childbearing age and menopause. Puberty is the period of first menstruation, usually between the ages of 13 and 16. Under the influence of hypothalamic pituitary hormones, a woman’s ovaries begin to produce sex hormones and menstruation begins. As the hypothalamus pituitary gland is not yet well developed, it can lead to irregular hormone secretion in the body and irregular menstruation. The fertile period is between the ages of 22-45, and is also a period of relatively stable hormone levels, during which ovulation can occur normally and fertility is achieved. During menopause between the ages of 45-55, ovarian function gradually declines, the body’s secretion of sex hormones decreases, the female secondary sexual characteristics gradually become less obvious, the ovaries do not ovulate, and there is no fertility.