According to Pregnancy Day by Day, women in their early 20's are the most fertile. As a woman ages her fertility declines, usually in late 30s and 40s. Also they mention a study done somewhere in France that says men over 35 take a longer time to get their partners pregnant.
Bibliography
MD, Amato, Paula, and Maggie Blott, MB, MS, eds. Pregnancy Day By Day. 1st ed. New York: DK, 2009. Print.
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