Keeping a person _technically_ alive is not that difficult with modern technology. We can circulate blood without hearts, keep the brain-dead "alive", "feed" pe

Keeping a person _technically_ alive is not that difficult with modern technology. We can circulate blood without hearts, keep the brain-dead "alive", "feed" people intravenously. I don't know the absolute limits of this in practice, but the more autonomy you're willing to sacrifice the easier it becomes to keep a human body alive by artificial means.