A woman’s fertility age has a significant impact on her ability to get pregnant naturally or with IVF using her own eggs. Generally speaking, women over the age of 38 or 40 years old have a very small number of eggs and their quality of them has been diminished over the years. A woman’s fertility actually begins to drop around the age of 28. The curve of decline becomes sharper around the age of 35 and accelerates again between the age of 39 and 42. In most cases, women's ability to get pregnant naturally ends about 10 years before menopause.