There are 3 main reasons why IVF is unlikely to be successful in women at the age of 50: 1. After the age of 35, ovarian function begins to decline, and by the age of 50, most women’s ovarian function has declined and they are already menopausal or in the perimenopausal phase. As ovarian function declines and egg quality decreases, the chances of fertilized eggs surviving are relatively lower, making it easier for them to fail to implant. 2. 3. When a woman is 50 years old, her whole body function level decreases, and after successful embryo transfer, various complications such as abnormal embryo development, premature rupture of fetal membranes, gestational diabetes, hypertension, etc. occur during the growth and development of the solution. The abnormal development of embryos and complications can easily lead to premature birth and stillbirth, resulting in pregnancy failure.