Can a woman over fifty fast and recite Qur'an when she has brown discharge for seventeen days following a disturbance in her previous menstrual cycle?

The maximum period for menstruation is fifteen days according to the majority of scholars. Recurrent bleeding is considered menstruation in two cases: 1. If, by combining it with the previous bleeding and the clean interval between them, the total does not exceed 15 days. 2. If there are thirteen days or more between it and the previous bleeding.

Therefore, blood that appears ten days after the cessation of the first bleeding is not menstruation but rather istihada (non-menstrual vaginal bleeding). A woman experiencing istihada must refer to her previous habitual period and consider those days as menstruation, and anything beyond that as istihada. If she does not have a regular habit, she should differentiate between menstrual blood and istihada blood. If she cannot differentiate, she should consider six or seven days of each month as menstruation. During the days of istihada, she must perform ablution for every prayer after its time has begun, taking precautions, and she has all the rulings of pure women.