A large number of usually educated older couples have an unrealistic expectation of fertility. Among the top reasons for infertility is "egg quality", and the negative effect of a woman's age on fertility cannot be overemphasized.
However, the causes of infertility involve women and men about equally and involve low sperm count, bad egg quality, anovulation, and fallopian tube problems. Other infertility causes include his sperms and her fallopian tubes.