On 9/10/2019 11:25 PM, Stathis Papaioannou wrote:
On Wed, 11 Sep 2019 at 12:00, Bruce Kellett <[email protected]
<mailto:[email protected]>> wrote:
On Wed, Sep 11, 2019 at 10:18 AM 'Brent Meeker' via Everything
List <[email protected]
<mailto:[email protected]>> wrote:
On 9/10/2019 4:30 PM, Bruce Kellett wrote:
> Another argument that has been given here before is that if
quantum
> immortality is true, then we should expect to see a number
of people
> who are considerably older than the normal life expectancy
-- and we
> do not see people who are two or three hundred years old.
Even if the
> probabilities are very low, there have been an awful lot of
people
> born within the last 500 or so years -- some must have
survived on our
> branch if this scenario is true.
My argument was that each of us should find ourselves to be
much older
than even the oldest people we know.
That is probably the best single argument against quantum
immortality: if QI is true, then the measure of our lifetime after
one reaches a normal lifetime is infinitely greater than the
measure before age , say, 120 yr. So if one finds oneself younger
than 120 years, QI is false, and if MWI is still considered to be
true, there must be another argument why MWI does not imply QI.
The measure of our lifetime when young might be larger than the
measure when very old if surviving as a very old person becomes
exponentially less likely. In any case, this is not relevant if it is
given that there will be a very old version of you in some corner of
the world, whether distant in time, space or in a parallel universe.
You cannot avoid surviving to become this version if it actually exists.
Right. Your observation of your age is conditional on your having
survived. So that your survival to a great age is improbable is irrelevant.
Brent
--
Stathis Papaioannou
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