Sorry to hear about your wife having to deal with breast cancer.
Midlife definitely seems to attack all of us and the weakest parts of our body seem to struggle to survive. I hope she wins her battle with that awful disease, and this is your chance to speak with actions and not words.
Glad you are recovering too, we are not immune from getting older. First rule is to take care of ourselves. As we are useless to anyone else if we are not healthy.
As far as getting decades older, I hope when I hit the next one shortly it is no big deal!