Im 41 year old woman last few months getting my period every 15 days from the time of starting the last one. why? is this normal now?

Frequent periods : There are multiple options. Hormonal treatments such as birth control pills, Progesterone treatments and the Mirena (levonorgestrel) iud are effective reversible treatments that will help many people. There is also a drug called Lysteda that contains no hormones which will help others. If you are done having children discuss the option of an endometrial ablation. In some cases a hysterectomy will be needed.