Women typically go through menopause between the ages of 45 and 55, with the average age being around 51 years. Some women may experience menopause earlier in their 40s, and a small percentage might have it even earlier or later, into their 60s. Menopause marks the end of menstrual cycles and occurs when a woman has gone 12 consecutive months without a period. The transition period leading up to menopause, called perimenopause, can start several years earlier, often in the 40s but sometimes as early as the mid-30s. Genetics, lifestyle, and medical factors can influence the timing of menopause for each woman.