We women are at 40 today enjoy better health than their mothers do and grandmothers did. So, if we want to have a baby there's no medical reason why we shouldn't. We should keep in mind that fertility drops rapidly at 40, even more so at 45, and is nearly finished by 50. I strongly advise a full medical examination including metabolism and autoimmune systems for any woman considering having a baby at a later age. Many studies have pointed to the importance of sex life in relationships and the overall importance of satisfactory relationships in health.
Sex is important.
We do have a drop in libido in age 50. There are women talking Viagra, but Viagra doesn't work in your mindset, where most of our sexuality is. You can't take a pill to feel sexier. Women need to invest in feeling sexy, having a positive view of them even if they've gained weight or experienced the tug of gravity. Invest in what makes you look and feel better.