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Lumifer comments on The map of quantum (big world) immortality - Less Wrong Discussion
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Under QI, doesn't everyone live to be a thousand years old and more?
Human longevity looks to have a pretty hard cut-off at the moment. We don't see anyone 150 years old, too.
Think of it like this: MWI makes the exact same predictions regarding observations as the Copenhagen interpretation, it's just that observations that are incredibly unlikely to ever happen in CI happen in a very small portion of all existing worlds in MWI. QI does not change this, which means that everybody does live to 1000 in a small minority of worlds, but in most worlds they die in their 120s at the latest. Therefore you're very unlikely to see anyone else besides yourself living miraculously long.
I don't believe the Copenhagen interpretation expects me to live forever.
Out of curiosity, have there been attempts to estimate the "branching speed" under MWI? How many worlds with slightly different copies of me will exist in 1 second?
It does not. There's the difference. But if someone looks at you from the outside, the probability with which they will see you living or dying is not affected by quantum interpretations.
As to your second question, I don't know. QI as it is presented here is based on a pretty simplistic version of MWI, I suppose, one which may have flaws. I hope that's the cased, actually.