That's actually a really good metric.

I keep getting old due to strokes but then I bounce back. Then a heart attack but then I bounced back. But both issues involve a lot of medical intervention and rehab of the body.

I guess the day I don't recover will be the first step into the grave.

By the way... I had a aunt that continued to mow her own lawn, and it was a big lawn, with a push mower until she was 101. So you can get pretty old before you get old.