This question is asking about the most common objections to indefinite life extension you encounter that you think are based on a misunderstanding or that you think are otherwise answerable.
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@Sailfish It is a very common argument used by bioethisists and others, yes. I doubt they've really thought it through, so they might not "really think it" in some sense, but they do say it as though they actually believe it.
@Sailfish This is the most common argument people use against life extension. I don't know of any good defense of it, and I don't think there is one.
@IsaacKing This. It's one thing to say that you, personally, would only like to live 80 years, but forcing that preference on all others and claiming you're doing it for the sake of "human dignity" is downright murderous. And yet opponents of life extension have to defend doing so.