copied this from the good Jwfacts site: bold added. From this teachings of Jesus you can see that wt is wrong about the generation, because
wt teaches, the generation will start in 1914, end at Armageddon. but below, read Mathew again: The generation survives Armageddon, does not pass away until all has occurred, but dies afterward. Quibbling about the overlap should be over, the second fulfillment idea of the generation itself is finished.
"Remember, Jesus said of those living through the last days, starting in 1914: "Truly I say to you that this generation will by no means pass away until all these things occur." (Matthew 24:34) Yes, peace will really come within this generation but not through the nations' efforts." Watchtower 1991 Apr 15 p.7