Heavy periods and periods lasting 3 days in a 50 year old woman may be normal in this case. At the age of 50, the majority of women are in perimenopause or have entered menopause. If they are in perimenopause, menstrual disorders may be caused by decreased levels of estrogen and progesterone due to declining ovarian function. Menstrual disorders may be characterized by an increase or decrease in menstrual flow, as well as changes in the number of days and menstrual cycles. Therefore, it may be normal for a 50-year-old woman to have a menstrual flow of 3 days. In addition to menstrual changes, perimenopausal women may have other perimenopausal symptoms such as excessive sweating and mood changes. If you experience any other discomfort, you should go to the hospital as soon as possible.