Words mean what they mean *in context.* In context Jesus was speaking of the Temple in Jerusalem, because he was talking about it as he left that area. That Temple was destroyed by the Romans in 70 AD. *That* generation.
We were taught by Hal Lindsey and others that the birth pain signs Jesus gave were for the Last Generation. In context, Jesus was speaking of signs that pointed to the destruction of the Temple. Signs like "wars and rumors of wars." The Roman Army had been active, and Jews in Jesus' time would've known what he was talking about.
There were also earthquakes and heavenly signs, in particular at the time Jesus was crucified. The persecution of the Disciples was also a sign. These were warnings to the generation of Jesus' Apostles that things were about to get very tough. And they did in 70 AD, and beyond.
Then you must believe Jesus second coming was in 70 AD because that is what he was talking about.
Luke 21
25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;
26 Men's hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken.
27 And then shall they see the Son of man coming in a cloud with power and great glory.
28 And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh.
See Jesus in the Olivet discourse was describing the day of the Lord when the Jews are led away captive and them which be in judea flees to the mountains and the lord and his saints comes to Jerusalem.You claim this took place in 70 ad and I say the day of the lord has not come yet .It is still a few years away.
Zech 14
14 Behold, the day of the Lord cometh, and thy spoil shall be divided in the midst of thee.
2 For I will gather all nations against Jerusalem to battle; and the city shall be taken, and the houses rifled, and the women ravished; and half of the city shall go forth into captivity, and the residue of the people shall not be cut off from the city.
3 Then shall the Lord go forth, and fight against those nations, as when he fought in the day of battle.
4 And his feet shall stand in that day upon the mount of Olives, which is before Jerusalem on the east, and the mount of Olives shall cleave in the midst thereof toward the east and toward the west, and there shall be a very great valley; and half of the mountain shall remove toward the north, and half of it toward the south.
5 And ye shall flee to the valley of the mountains; for the valley of the mountains shall reach unto Azal: yea, ye shall flee, like as ye fled from before the earthquake in the days of Uzziah king of Judah: and the Lord my God shall come, and all the saints with thee.