Well... I am old. So, every day, I experience the sorts of things you mentioned. In some ways it can be depressing. But in other ways it's a comfort because I no longer feel as though I have to maintain any pretense of being young, strong & competent (since I never really was anyway... I just tried to make other people think I was.)

I also find my own aging process to be something of a comfort because I have no interest in prolonging my life any longer than necessary. So, from that perspective, all of my own signs of aging act as little reminders that, although I may still live on for quite a few more years, I'm definitely approaching the end. Besides... there's no way I know of to go back under any circumstances. So I might as well just enjoy the parts of growing old that can be enjoyable. And there are some...