Answer:
50%
Step-by-step explanation:
A recent study showed that with each menstrual cycle 20% of women aged 30-31 will become pregnant. This percentage drops to 13.2% in the 38-39 age range and to only 6.6% at 42-44 years.
However, the incidence of twin pregnancy tends to increase after age 30, as messier menstrual cycles can make women release more than one egg a month.