The end of that Age came in 70 A.D. The last days of that Age began when Jesus was baptized by John the Baptist. John and Jesus are the two prophets who came in the last days. Jesus was more than a prophet of course (infintely more).
The end of
that age was the death, burial, and resurrection of Jesus Christ. Anything else is human addition to God's Word.
The destruction of the flesh, the physical temple and Jerusalem was just humans holding out past the necessary time. If the Jews had complied at the end of the age, they would have torn down the Temple, themselves, and had all the stones cleared by Pentecost.
The Jews were stubborn and God already knew that. But God did not come in Judgment in 70AD. The Jews brought down their own Judgment, when they declared the innocent blood of Jesus was on their hands, and the hands of their children. Two generations.
Compared to the 40 years in the wilderness coming out of Egypt, there were also 2 generations destroyed in the desert. Those 40 and over, and those 70 and older. Only those 20 years of age, and their children who would have been in their 30's and their children, who were adolescent entered the Promised land.
A new generation happens every 20 years. Even at the Exodus, most of humanity did not wait 40 years between generations. 40 years just ensures that one in their 20's will have had a full life by their 60's. If the Sanhedrin which condemned Jesus to death averaged from 60 to 80, 40 years later, they would be 100 to 120 years of age. Many would have already passed. Even Saul who was probably 20 at the Stoning of Stephen was martyred some 38 years later at 58, a relatively old man, but still could have lived another 20 years past 70AD.
Dating the end of the age at 70AD is only dwelling on the physical aspects of carnal sinful human beings living in spiritual rebellion. Desolation was still going to happen one way or the other.
God Himself planned the Cross event, but instead of repentance and sorrow, His people chose to bare all the responsibility on themselves, instead of accepting God's plan.
In extension, those today who place all the emphasis on 70AD are still bearing that carnel sinful attitude that 70AD was the end of the age. They seem to ignore that the end of the age was the Cross, and want to extend it to the actual destruction of a physical outward showing of rebellion.
Then many take the glorious Second Coming when both God on the throne and the Lamb appear on earth, and muddying up this appearing into that carnel fleshly rebellion of the Jews in 70AD.
The OD had 3 questions, and only two of them were answered directly. When is the end was answered by Jesus. When is the Second Coming was answered by Jesus. Jesus never specified the destruction of the temple and Jerusalem that was to be made desolate. Had the Jews torn down their temple the week of the Cross and repented, Jesus would have been a liar to claim the Romans will do it in 70AD.
Yes Jesus was talking about His death and Resurrection. Jesus was also stating that if they tore down the physical temple God would have been able to rebuild one in 3 days as well. Would the fullness of the Gentiles still be gathered in? Yes of course. Would all of the tribes be brought back to Israel. With Jesus ruling in Jerusalem, most assuredly. The Jews repenting, and God healing their nation in the first century would not have been unreasonable to God nor to prophecy.
But to say that 70AD was
the game changer will not work other than the desolation was complete, and the fulness of the Gentiles would continue for another 1951 years.