However, rates of ectopic pregnancy also rise considerably with age: Most of the rise in fetal losses came from an increase in miscarriage. The risk of pregnancy loss rose sharply by a woman’s late 30s and reached nearly 100% by age 45. ![]() She tracked every “reproductive outcome”–pregnancies, miscarriages, births, stillbirths, and induced abortions– from a total of over a million pregnancies. How The Chances of Miscarriage Vary By AgeĪnne-Marie Nybo Anderson, of the Danish Epidemiology Science Centre, led the largest population-based study ever conducted on age and miscarriage. On average, a woman in her early 20s will have chromosomal abnormalities in about 17% of her eggs this percentage jumps to nearly 80% by a woman’s early 40s. And as men age, chromosomal defects and point mutations–changes to a single nucleotide in their DNA–become increasingly common. As women age, chromosomal defects in their eggs become increasingly common. Over half of miscarriages are caused by genetic abnormalities. Having a partner over the age of 40 significantly raises the chances of a miscarriage. ![]() By age 45, less than 20% of all recognized pregnancies are viable. The risk of miscarriage rises as a woman ages, with a dramatic rise starting after age 37, with the steepest increase occurring after age 40. As women, we hear a lot about the difficulty of getting pregnant as we age, but staying pregnant can often be the bigger challenge, especially as our fertility begins to wane.
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