Today, 80% of babies with Down syndrome are delivered to women under age 35. This is because

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The statement is true because younger women have more babies overall compared to older women, and while the risk of Down syndrome increases with maternal age, the larger number of births by younger women results in a higher absolute number of babies with Down syndrome born to this group. Amniocentesis, a diagnostic test that can detect Down syndrome among other conditions, is more commonly offered to women over 35 due to the increased risk of chromosomal abnormalities with maternal age, leading to a higher detection and possibly higher termination rate of pregnancies affected by Down syndrome in this age group.

Today, 80% of Babies with Down Syndrome Are Delivered to Women