IMO when the Lord said this generation He meant the generation who would see everything mentioned in Matthew 24
He tells them Of two times one applicable to Jerusalems deetriction in 70 ad
And he’s also telling them About
the end of the world another time far off
“And as he sat upon the mount of Olives, the disciples came unto him privately, saying,
Tell us, when shall these things be? ( Jesus just told them the City and temple would be destroyed soon )
and
what shall be the sign of thy coming, and of the end of the world?”( he’s also talking about the far away end of the world )
Matthew 24:3 KJV
some in Matthew is about what happened in 70 ad when rome besieged the sort and destroyed the temple other things he’s talking about concern the end of the world and his second coming
“Immediately after the tribulation of those days shall
the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: and then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and
they shall see the Son of man coming in the clouds of heaven with power and great glory.”
Matthew 24:29-30 KJV
So he is actually talking about people until the end of the world d also he was talking about the desolation of Jerusalem
this time
“And
when ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh. ( 70 ad)
Then
let them which are in Judæa flee to the mountains; and let
them which are in the midst of it depart out; and
let not them that are in the countries enter thereinto.
For
these be the days of vengeance, that all things which are written may be fulfilled.”
Luke 21:20-22 KJV
this part is about the destruction of Jerusalem in 70 ad but the end of the world and Jesus second coming hasn’t happened yet which he’s also talking about in Matthew 24 there’s two subjects he’s addressing immediate future of Jerusalem and it’s temple
“And Jesus went out, and departed from the temple: and his disciples came to him for
to shew him the buildings of the temple. And Jesus said unto them,
See ye not all these things? verily I say unto you, There shall not be left here one stone upon another, that shall not be thrown down.”
Matthew 24:1-2 KJV
thisbhappened when Jerusalem was beeeoged and destroyed in 70 ad
abut this part hasn’t happened yet
“And as he sat upon the mount of Olives, the disciples came unto him privately, saying,
Tell us, when shall these things be? ( the temples destruction )
and what shall be the sign of thy coming, and of the end of the world?”
Matthew 24:3 KJV
in Matthew 24 Jesus is addressing until the end of this world and his return from heaven also he’s told about the great tribulation and destruction of Jerusalem which they endured