'Generation' in the Bible

Sighing deeply in His spirit, He *said, “Why does this generation seek for a sign? Truly I say to you, no sign will be given to this generation.”

For whoever is ashamed of Me and 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.”

And He *answered them and *said, “O unbelieving generation, how long shall I be with you? How long shall I put up with you? Bring him to Me!”

Truly I say to you, this generation will not pass away until all these things take place.