Menopause is the time in a woman's reproductive life beginning one year after her last menstrual period. Once a woman has reached menopause she can no longer get pregnant. In the time leading up to menopause, she can have hot flashes and other physical symptoms. The time in the woman's life leading up to menopause is called perimenopause. Menopause happens between the ages of 45 and 55. Menopause can happen earlier if you have had treatment for cancer or operation to remove both ovaries. Menopause can happen after surgery to remove the uterus.