They used to say that a prophecy is better understood while it fulfills.
Instead of admitting that they were wrong about 1914, they keep coming up with crazy forced tentatives to explain this falsehood originated in pyramidology.
to see how many years a generation is they should read the genealogy of Jesus in Mathew, at the end of the genealogy it says there were 14 generations from Abraham to David, 14 generations from David to Jesus.
Jesus said that generation when all happens will certainly not pass. Truly! I believe Jesus!