Doctors typically recommend that couples try to conceive naturally for six months before considering IVF. IVF is also a good option for a person or couple who need to use donor eggs or sperm to conceive. Success rates per IVF cycle are correlated to a woman’s age. A woman age 35 or younger has a 35 to 50 percent success rate per cycle; a woman who is 40 or older has about a 10 percent chance of success.