A generation back at that time was under 80 years. Hello? 136 Contradictions in the Book of Matthew alone!
Matthew 16:28 KJV
28 Verily I say unto you, There be some standing here, which shall not taste of death, till they see the Son of man coming in his kingdom.
Matthew 23:36 KJV
36 Verily I say unto you, All these things shall come upon this generation.
Matthew 24:34 KJV
34 Verily I say unto you, This generation shall not pass, till all these things be fulfilled.