What is Infertility? Infertility is a disease or condition of reproductive system often diagnosed if a couple has failed to conceive after one year of unprotected, well timed intercourse, or if the woman has been unable to carry a pregnancy that results in a live birth. Primary Infertility : Infertility without any previous pregnancy. Secondary Infertility : When there has been a previous pregnancy. Sterility : When there is no chance for natural pregnancy. This is different from infertility which generally represents a reduced potential for pregnancy. Most childless couples with a female age under 42-44 years that are having problems of getting pregnant are infertile but not sterile. Probability of Pregnancy Declines with Advancing Age : The affect of age on incidence of infertility and on the result of the therapy cannot be ignored. It is well documented that there is diminished fecundity with increasing age. A woman reaches the maximum fertility potential at the age of 24 years. By the age of 30 her fertility begins to decline. However, the decline is not significant, until the age of 35 and it is more marked after 40 years.