My anecdotal experience is that whenever old people fall and break something, then it all start going downhill, health wise, very quickly.

I’ve always thought it’s because they don’t have very much muscle to begin with, that braking a leg or something, forces you to be still so much that you loose whatever muscle you do have left. That in turn has other negative effects; socially from not going out of your house, maybe even cardiovascularly, mentally, etc.

That’s how it’s been for my grandmother, and for my wife’s grandparents. Purely anecdotal.