I was raised in the 'truth' as our culty dub friends like to say. As a child and into my teens I never really questioned it. I did wonder at times how it was that the generation that I just happened to be born in would be the one to see this earth shaking event, and then be the ones to never experience death. On one hand, it was kinda 'cool' to never grow old and die; on the other, there was this lingering doubt... what if this isn't the 'truth'. And of course, as a fully indoctrinated JW, I pushed those doubts out pretty quickly, never allowed them to surface longer enough to gain a foothold.
But as I started doubting other doctrines this one kinda fell away without much consternation. Once you realized that the 'truth' was anything but, it went without saying that to believe that you would live forever was preposterous.