Well when you get down to it the thing about pre-birth and post-death is time: both those periods are arbitrarily long, but subjectively instant between moments

Well when you get down to it the thing about pre-birth and post-death is time: both those periods are arbitrarily long, but subjectively instant between moments when your conscious experience was running. 10^100 years post death and you've really only "just" died, subjectively - if a random collection of matter suddenly flickers into existence in the appropriate configuration, then despite the distance of time "you" suddenly come back to life.