One of the friends was saying how his grandmother was similar, but as Alzheimer's set in, they moved her from a house to an apartment bad a year later, she was gone.
This happened to my grandmom, although she was already 91, when they moved her out of her house ( with big garden ) and into an elderly home. She lived for two more years.
Her (daily) garden(ing) and social life, she outlived my granddad for 22 years ( although I must add that he was 9 years older ) clearly added to her longevity. Once she became mostly sedentary and taken out of her home, she deteriorated rapidly.
I could say the same about my dad too. Due to his lung disease and - later - fear of breathing ( even fresh air ), he started getting out less and less. As a result of this, his muscles deteriorated, he burnt all his fat and he slowly but steadily withered away, where up till his diagnosis he had gone on daily long walks.
All of the aforementioned and your post are a reason why I move daily ( especially walking/hiking and cycling and - as an added bonus - outdoors, in nature. And, as you might know, I don't even drive a car.