In the novel Fallen Angels, the authors state at one point that the abandonment to their death of the elderly was common practice among the Innuit. While a disregard for the aged might, in a way, be expected in a culture known to treasure children greatly, I can’t believe that the Innuit were as callous as that.
To give context, the premise of the story is partly concerned with the inhabitants of an orbiting Earth space station which was no longer receiving supplies from an Earth that had turned its back on space travel. The protagonists speculate that before long, if things continued as they had been, the elderly would be executed to preserve scarce resources, by being placed in airlocks and having the air pumped out. There would be no anesthetic, since medicines must be conserved, and they would be naked when terminated, so as to preserve textiles.