First the good news: A recent study shows that women over 40 who have babies without help from fertility drugs or other assisted reproductive technologies tend to live longer than those who don't. Why? One theory is that estrogen, which is still produced in abundance in fertile women, has life-lengthening effects on the heart, bones, and other organs. However, fewer than 1 percent of women ages 40 to 44 have babies. The chance of becoming pregnant during any one month drops to only 5 percent after age 40.
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