retired or tired? -- old and woreout or just old?

I'll be 73 in July. I still do most of the things I used to do (except run; can't do that). It just takes me longer to do it, and I don't last as long in my endeavors as I used to. I have to stop and rest more often. But, I'm convinced that if I just "lay my burden down", I won't pick it up again, ever. I don't want that, so I keep on pluggin' away at it.