This looks pretty plausible to me, because it does seem there is some disutility to the simple fact of dying, regardless of how far in the future that happens. So U(live N years) always contains that disutility, whereas U(live forever) does not.
This looks pretty plausible to me, because it does seem there is some disutility to the simple fact of dying, regardless of how far in the future that happens. So U(live N years) always contains that disutility, whereas U(live forever) does not.