With advancing age, the quality as well as the quantity of the eggs significantly reduce. A woman is born with all of the eggs she will ever produce, whereas men, in spite of advancing age, can keep producing sperm. Although it must be noted, sperm quality also decreases as men age, even though it can be continually be produced and so it must not be assumed that men will always produce good quality sperm forever more. As a result of such a phenomenon, women face more fertility issues in their early and late 30s. Moreover, women in their 40s are more likely to face fertility problems and might require assistance for the same.