A long long time ago, when parents became old and useless, they would just dig a hole in the ground and drop grandma or grandpa in it, they were to weak to climb out. They would die there and the tribe would no longer waste resources on them. You are behind the times on your thinking, resources are not scarce. Or are you just evil?
Look at the american indian, an old man would walk away with a knife "maybe not" and just face nature head on to see if he was ready to die. Can't run away and climbing is unlikely so it's fight or die or just have the awareness to see deaths sign approaching in the shape of a wolf or a bear or mountain lion.
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