 [ Symptoms ] how does age affect fertility [ Disease ] as women reach their thirties they experience a decline in fertility furthermore complications during pregnancy are more common when women reach age 35 age related decline in fertility may be due in part to the following a decrease in the number and health of the eggs to be ovulated changes in the hormones resulting in altered ovulation fewer number of eggs a decrease in sperm counts a decrease in the frequency of intercourse the presence of other medical and gynecologic conditions such as endometriosis which may interfere with conception