Surveys show that the success rate of IVF can reach an average of 50% among women between the ages of 25 and 35, but the success rate gradually declines after the age of 35, reaching only about 20% by the age of 40, due to a decline in the quality and quantity of eggs as they age. As a result, IVF often needs to be performed several times over to be successful. The key to IVF depends on the woman’s physical condition. IVF must be done with extra care, and its success depends on the availability of good eggs, embryos and a good endometrial environment, and these three key steps all depend on the woman’s condition. With a good condition of the female partner, there is also the support of advanced instruments and equipment to ensure that high quality eggs are retrieved, cultured into healthy embryos and finally successfully transferred to the female partner’s uterus. In addition, the age of IVF is also important. 25 to 35 years old is better for IVF, according to the research of experts, couples who are ready to have children and want to do IVF must pay attention to the best age for IVF. It is better for women to solve the problem between 25 and 28 years old, an age when it is easy to conceive, keep and have good quality. If infertility is found, it is important to hurry up and get treatment. IVF is okay at the age of 25 to 35, but the success rate of IVF is lower after the age of 40.