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Abortion (miscarriage) risks

The risk of clinically recognized abortion increases from about 10 – 12 % in women under the age of 30 years, to 18 % in the late 30s and to 35 % in the early 40s.

The overall abortion risk (recognized and unrecognized) in women over the age of 40 years is approximately 75 %.

Fertility rates

The French studied the pregnancy rate in a sperm donor insemination program. These were all healthy women with no obvious infertility factors. This process therefore would have excluded a male factor, and we can make the assumption that this data would be a reasonable reflection of the effect that age may have on fertility.

The pregnancy rate for women per year

Below age 31 years 74 %
Age 31 – 35 years 62 %
Above age 35 years 54 %
It is safe to say that about 1/3 of women who defer pregnancy until the mid thirties will have an infertility problem, as will at least half of women over the age of 40.

Expectations of Pregnancy per cycle by age

<30 years 25 %
30 –35 15 – 20 %
35 – 40 10 – 15 %
>40 5 – 10 %