How does age affect fertility in woman?

Women reaching their thirties will experience a decline in their fertility. It could be due to the following problems:
• A decrease in the number and health of the eggs to be ovulated.
• Changes in the hormones resulting in altered ovulation.
• Fewer numbers of eggs.
• A decrease in the frequency of intercourse.
• The presence of other medical and gynaecologic conditions, such as endometriosis, which may interfere with conception.