How Long is too long

This trip was all about spending few hours with my Grand Ma. At nearly 95, and according to the fact I am unlikely to come back before at least few years, it is unlikely as well she will be still alive next time.
Or not.
Seeing the conditions we keep our old people in a geriatric center makes you wonder if this is worth it. Tired, in pain, losing memory, cruising endlessly the same white corridors, barely limping if not wheeling, is it really a life to be lived ?

First half of your living space

Second half

Progress of the medicine are impressive, to the point it might be unnatural. Oxygen if you can't breathe, intravenous feed if you cannot eat or drink, pain medication if you suffer, pacemaker if your heart is tired, ... Is it even possible to pass away anymore ?
But the body is giving up.
The mind is giving up.
And you end up crawling through life for years and years.
Now I am worried. How will it be in 40 years ?
At this pace, will I live forever ? Crawl forever ?
And should I ?