my answer : sort of , yeah. I'm fuckin old (51 ) with a back I've been rehabbing for the last 25 years, and crappy knees I can't do any serious weight with, but one thing I know is that if I don't keep up my ha;f-assed regimen I fall apart really quick and it's hard to get back. So all you young whippersnappers out there should keep up some kind of program, not necesarily heavy , low rep strength training , but something. They don't say "use it or lose it" just because it's a clever phrase.
I don't have a choice , because my work requires good arm/hand/ shoulder
strength and endurance , and I have to lift buckets and sheets of metal around regularly , so if I don't stay reasonably strong , I don't last long in my career. Mostly I do sets of 20 -50 with medium weight , and a few high weight sets with low reps, to get some strength and some endurance .
Hardly any cardio or heavy weights on the legs because of my frakkin knees, but I work around that . Shallow "deadsquats" of 100 lbs x 100 reps , or 150 for 50 reps . Weak old shit, yeah , but at least I'm still doing it ...