Once you reach a certain age, you may notice that your periods start to become erratic and irregular. You may notice that your menstrual periods are shorter or longer. You may experience spotting in between your periods, and you may even go a month or two between periods. Every woman is different, but you should expect period changes once you near the end of your reproductive life.
When you hit your 40s, you may want to start paying attention to the signs and symptoms of perimenopause.