I am convinced that being strong is the single most important thing any human being can do once all of their basic needs are met.
After having entered thousands of houses as a volunteer EMT and seeing people younger than my parents who on the verge of becoming incapable of self-sufficient living due to frailty, no other problems just muscle (and bone) loss, I am absolutely irrefutably convinced that every single human being on earth would benefit from pumping some iron.
I just looked it up and even patients with brittle bone disease are highly encouraged to become as strong as possible through physical therapy because of the benefits of being strong.
There is but an insignificantly vanishingly small sliver of humanity too sick to strength train, even if it is just overhead pressing some cans of chicken noodle soup while you watch tv.