Our eggs grow older with us. As the quantity of eggs remaining drops, so does the health of those eggs, which refers to the number of chromosomally normal eggs. After the age of 35, the frequency of chromosomal changes in the eggs increases. This can make conceiving in your late thirties and forties more challenging.

Sperm health declines with aging. Younger sperm are healthier and more active, which increases the chances of pregnancy and reduces the time it takes to conceive.