Less Frequent Menstruation
When you notice that your periods are occurring less frequently, it is usually the first sign that your menopause is approaching. Asides that the menstruation becomes less frequent, it could also appear irregular from how it usually occurs; it could be heavier or lighter.
Any form of menstrual change may not necessarily mean menopause; it could also indicate that one is pregnant or has some health issue. This is why you should visit you doctor, if you notice any change in your menstrual cycle.