Otoshiyori was a female servant post (or also indicated the servant herself) in O-oku (the inner halls of Edo Castle where the wife of the Shogun and her servants resided) in the Edo period, and was often called Rojo as well.
御年寄（おとしより）は江戸時代の大奥女中の役職名で、老女と呼称される事もある。