For the past two years my cycle has varied month to month. For example, if I started my period on October 1, the following month I would start on November 5. Also, the pain during my period has intensified during the past year. I am 36 years old. I don't know what is normal for you.
Every woman is different.
But you may consider this a normal sign of aging. Hotflashes, or sweats may start years before you actually go through menopause, not to mention changes in your menstrual cycle. It is easier to get pregnant when you know exactly when your period will come. So women with regular cycles have an easier time in planning pregnancies. You can usually tell when this is because your vaginal discharge becomes wetter and heavier at this time.