I know that was to someone else but I assume you mean Mat 24?
"24:34, "“Truly, I say to you, this generation shall by no means pass away until all this takes place."
he does not mean the generation He is speaking to, I can prove this from that verse: "until all this takes place"
He is talking about the generation that sees all of the things he describes, everything he said was not complete.
He also talked about His second coming, which is detailed in Daniyl and Revelation, neither have been completed yet...
"24:27, "“For as the lightning comes from the east and shines to the west, so also shall the coming of the Son of Aḏam be.
"24:28, "“For wherever the dead body is, there the vulturesd shall be gathered together. Footnote: dLuk 17:37.
"24:29, "“And immediately after the distresse of those days the sun shall be darkened, and the moon shall not give its light, and the stars shall fall from the heaven,f Isa 13:10; Isa 24:23, Eze 32:7-8, Joe 2:10, Joe 2:31, Joe 3:15 and the powers of the heavens shall be shaken.g Hag 2:6, Hag 2:21 Footnotes: eOr pressure. fAlso see Amo 5:20, Amo 8:9. gAlso see Isa 34:4.
"24:30, "“And then the sign of the Son of Aḏam shall appear in the heaven, and then all the tribes of the earth shall mourn, Zec 12:10, Zec 12:14 and they shall see the Son of Aḏam coming on the clouds Dan 7:13 of the heaven with power and much esteem.h Footnote: hAlso see Dan 7:14.
"24:31, "“And He shall send His messengers with a great sound of a trumpet, Isa 27:13 and they shall gather together His chosen ones from the four winds, Dan 7:2 from one end of the heavens to the other. Deu 4:32.