Witness 007: How does that even work.
About as well as any of the other crap they teach. They decided that Jesus's comment about the temple's destruction within the lifetime of those listening to his speech also applied centuries later, to the people who were alive in 1914. It's nonsense. They came up with it to use it as a way to create a sense of urgency. Remember that they kept tinkering with the explanation: first, it was people who were in their teen years in 1914. Then, it was toddlers. Then, it was those who were born that year.
The idea was to make it seem as if the end was imminent. By 1995, they had stretched the explanation so thin that it was clear that it was becoming a problem, as the generation born in 1914 would be 80 years old. So they quietly dropped it, which is how that particular mess should have ended. Why they decided to try to revive it with the "overlapping generations" disaster is anyone's guess, but I am thinking that Tony Morris must have purchased extra booze before that meeting.