Figure 3From: Biological versus chronological ovarian age: implications for assisted reproductive technologySome women undergo premature menopause whereas others conceive naturally in their late forties. Reproduced with permission from Ferrell et al. Monitoring reproductive aging in a 5-year prospective study: aggregate and individual changes in luteinizing hormone and follicle-stimulating hormone with age. Menopause 2007, 14:29-37.Back to article page