I think eventually some kind of "cutoff" point will have to be defined. I imagine that in the future it may be possible to keep people "alive" indefinitely while attached to expensive machines. So the costs may well be infinitely high.

In the UK I heard you don't get Dialysis after a certain age, which I always found quite shocking. But some equivalent of that will probably happen everywhere :-(

Also the worthiness of the previous comment probably referred to people actively ruining their health. That could be seen as freeloading off society.