My "understanding of when the referenced Generation starts" comes from the actual words of Scripture. Jesus said "THIS generation" -- the one he was addressing -- would not pass away before the predicted events occurred. There is nothing in his quoted words to suggest that "THIS generation" was a reference to "THE FOLLOWING generation after this one." If a "generation" is code for a millenium, then whether he and his audience were at the beginning of one, the middle of one or towards the end of one, the absolute end point for when the events would occur would be the Eleventh Century. So either you're wrong or Jesus was wrong. (Or both.)
"This generation" can only be the generation that sees the fig tree blooming in all aspects of these 3 accounts.
Jesus never said the generation that sees Jerusalem destroyed would see all these things.
Where is the phrase in any Scripture, where Jesus said, "You all are the generation that will see all things"?
No where!
Luke 21:
31 So likewise ye, when ye see these things come to pass, know ye that the kingdom of God is nigh at hand.
32 Verily I say unto you, This generation shall not pass away, till all be fulfilled.
This does not say they will see all things. It says all things will have been fulfilled, even if it takes 2,000 years. Still the generation that sees the fig tree bloom, will be alive when all things are fulfilled.
Matthew 24:
33 So likewise ye, when ye shall see all these things, know that it is near, even at the doors.
34 Verily I say unto you, This generation shall not pass, till all these things be fulfilled.
The generation that sees all things, will not see Jerusalem destroyed, because the destruction of Jerusalem is not even mentioned in the list of future events. Jerusalem being destroyed was only in the list of things in Luke 21.
The "ye" in both passages is not those hearing that day, because those people did not even see Jerusalem destroyed. They were all dead within 40 years. The only person not dead at that point is John. And many want to say that Revelation was written, and John was dead prior to 70AD. So literally none of the generation who would have been listening that day were even alive to see the fig tree wither away in 70AD, much less bloom again after being dead for hundreds of years, from 70AD to 1948AD.
So only the "ye" that experiences 1948 would know all things had been fulfilled. That was 2 generations before my time. I have seen 2 more generations in my lifetime. So not even the last generation, would see all things, as the current generation wishes that Israel was not even a nation, as they are not the generation that saw the fig tree bloom.
For example:
The current 46th President of the United States is 81. He was only 6 years old in 1948. He is hardly a candidate to appreciate the full experience at 6 years old, but his parents would. Now he would understand it more than his grandkids do. And people complain that he is too old, and his health failing him. Can you imagine if we had a President who is 100 that would truly be the generation that saw the fig tree bloom?
That is the point Jesus made. That some people currently around 100, would still be alive at the very end, and would see all these things take place.
In Scripture we see only 2 individuals alive, Anna and Simeon who were the generation expecting the coming Messiah after 434 years, as written in Daniel. They were not still alive 30 years later when Jesus actually died on the Cross. Then you have many today who don't even accept that is what the parable of the fig tree means.
How can you say that generation at the Temple that week saw all things, when they did not even see 70AD? Those who claim 70AD was when all happened, don't even think John was alive at that point.
Jesus was not talking to only 6 year olds that week, as far as we know.