The specific use of "this generation" clearly refers to "this generation" not some future generation.
Not to mention that other accounts refer to "some standing here" etc.
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Copper, Jesus was answering a specific question.
(Matthew 24:3) While he was sitting on the Mount of Olives, the disciples approached him privately, saying: “Tell us, when will these things be, and what will be the sign of your presence and of the conclusion of the system of things?”
Little did they realize at the time they actually asked 2 question.
"When will these things be? " was asked with respect to the destruction of the temple Jesus Jesus spoke of in verse 2 of the same chapter.
But they also asked about the "sign" of his "presence". It was to be the "generation" that recognized "all these things", that began in 1914 with WW1 - ( Matt 24:7-14), that would "know that he is near at the doors". Mankind in general will remain preoccupied with mundane things.
(Matthew 24:38, 39) For as they were in those days before the Flood, eating and drinking, men marrying and women being given in marriage, until the day that Noah entered into the ark, 39 and they took no note until the Flood came and swept them all away, so the presence of the Son of man will be.
With others there will be a cynicism that no amount of evidence will shift.
(2 Peter 3:3, 4) First of all know this, that in the last days ridiculers will come with their ridicule, proceeding according to their own desires 4 and saying: “Where is this promised presence of his? Why, from the day our forefathers fell asleep in death, all things are continuing exactly as they were from creation’s beginning.”
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