Prologos
(Matthew 24:32-35) 32 “Now learn this illustration from the fig tree: Just as soon as its young branch grows tender and sprouts its leaves, you know that summer is near. 33 Likewise also you, when you see all these things, know that he is near at the doors. 34 Truly I say to you that this generation will by no means pass away until all these things happen. 35 Heaven and earth will pass away, but my words will by no means pass away.
Again, there appears to be difference between the sign and the destruction that follows.
*** w15 8/15 p. 15 par. 7 Keep in Expectation! ***
*** w14 1/15 p. 31 par. 16 “Let Your Kingdom Come”—But When? ***
Yet, Jesus’ words at Matthew 24:34 give us confidence that at least some of “this generation will by no means pass away” before seeing the start of the great tribulation. This should add to our conviction that little time remains before the King of God’s Kingdom acts to destroy the wicked and usher in a righteous new world.—2 Pet. 3:13.
*** w14 1/15 p. 31 par. 16 “Let Your Kingdom Come”—But When? ***
The second group included in “this generation” are anointed contemporaries of the first group. They were not simply alive during the lifetime of those in the first group, but they were anointed with holy spirit during the time that those of the first group were still on earth.
According to the above wt, the oldest anointed of the second group that qualifies must have been born about 20 years AFTER 1914 to be an anointed contemporary of the first group. The wt and all jw are all in: that everything converges within a year or so. However, there is a safety valve in the wt defining generation above, younger anointed born after 1934 also qualify. But as TD poetically mentioned, there are inherent features in the prophecy that limit length of generation one of which is the great crowd.