'Generation' in the Bible

But sighing deeply in His spirit, He said, “Why does this generation demand a sign? I assure you: No sign will be given to this generation!”

For whoever is ashamed of Me and of My words in this adulterous and sinful generation, the Son of Man will also be ashamed of him when He comes in the glory of His Father with the holy angels.”

He replied to them, “You unbelieving generation! How long will I be with you? How long must I put up with you? Bring him to Me.”

I assure you: This generation will certainly not pass away until all these things take place.