Luke 21:23, Jesus said, “Truly I say to you, this generation will not pass away until all these things take place.” The things that Jesus had been speaking of the rise of the Antichrist, the desolation of the holy place and the darkening of the sun did not happen during the lifespan of people alive in Jesus’ day. Obviously, Jesus must have meant something different when He spoke of “this generation.” What did he mean?
Lk 21:29-32
29 And he spake to them a parable; Behold the fig tree, and all the trees;
30 When they now shoot forth, ye see and know of your own selves that summer is now nigh at hand.
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.
KJV
Mt 24:32-34
32 Now learn a parable of the fig tree; When his branch is yet tender, and putteth forth leaves, ye know that summer is nigh:
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.
KJV
In both Mat 24 and Luk 21 Jesus reveals the signs of the end times.
In the parable of the Fig tree, the sprouting of the Fig tree is a figure of the promised restoration of national Israel.
Isa 66:8
8 Who hath heard such a thing? who hath seen such things?
Shall the earth be made to bring forth in one day? or shall a nation be born at once? for as soon as Zion travailed, she brought forth her children.
KJV
The nation is modern Israel. The day is 11/17/1947 when the U N mandate giving Britain control of Palestine was revolked, and Israel was given self government.
The answer to your question is that at least 1 person who was alive on 11/17/1947 will live to see the Lord's return.
IMO the rapture will occur earlier.