Mothers who have several of the risk factors and severe urinary incontinence, frequent urination during the night, sometimes even a vaginal prolapse (walls of the vagina collapsing inwards) accompanied with sexual problems will need treatment for longer (at least 20 sessions).
If the result isn't satisfactory and problems persist, even after prolonged therapy followed through properly, then pelvic floor surgery might be considered. This type of surgery provides excellent results, no matter what age you are!