It turns out that as we women age, our eggs may not shrivel up and die, as has been the scientific belief. A paper in Nature on a study in mice found that their eggs die at such a rate, that a mouse would lose all her eggs within a few months. On further investigation they found stem cells present in mice ovaries that produce eggs throughout the mouse's life. Researchers suggest that death of the stem cells may lead to eventual infertility in adult women and if this is the case, new fertility treatments may be possible.