I am 39, and am so not looking forward to turning 40. Is a good life possible after 40?

The fear of aging exists in almost all of us. It's fine if you're worried about getting older, you are certainly not alone in this regard. We all think about it. But understand that all ages, young and old, have their advantages and drawbacks. I'll speak from the point of how our body changes when we turn 40, on both the good and the bad.