What are the changes that occur in the menstrual cycle of a 48-year-old woman in menopause who has given birth to 4 children?

A woman who has reached menopause often experiences a cessation of bleeding. However, if she sees blood after menopause, it is either menstrual blood if it has its characteristic features, or Istihada (non-menstrual) blood if it does not have its characteristic features. In the latter case, it does not prevent prayer or fasting, and it has the rulings of Istihada.