It’s a biological fact that as women and men age, their potential to have children decreases, although the exact time when this starts to happen can vary among individuals.
We all know someone who had a healthy baby in their late 30s or early 40s. But of all people who try for a baby at a later age, many will not have the baby they hoped to have.
Across a population, women younger than 35 and men younger than 40 have a better chance of having a child than people who are older. This is true for natural pregnancies and for pregnancies conceived through assisted reproductive treatments such as IVF (in-vitro fertilization).