Infertility difficulties are also due to the age of the mothers (and sometimes fathers) when [[pregnancy]] is desired. Fertility rates are highest in the early 20's, but decrease over time, dropping steeply starting around age 39. The exact rate of fertility decline will vary from woman to woman. In Western culture it has become common to extend the age when a family is first desired, leading to greater instances of infertility due to age. | Infertility difficulties are also due to the age of the mothers (and sometimes fathers) when [[pregnancy]] is desired. Fertility rates are highest in the early 20's, but decrease over time, dropping steeply starting around age 39. The exact rate of fertility decline will vary from woman to woman. In Western culture it has become common to extend the age when a family is first desired, leading to greater instances of infertility due to age. |