'Generation' in the Bible

And Peter solemnly testified and continued to admonish and urge them with many more words, saying, “Be saved from this crooked and unjust generation!”

“In humiliation His judgment was taken away [justice was denied Him].Who will describe His generation?For His life is taken from the earth.”

For David, after he had served the purpose of God in his own generation, fell asleep and was buried among his fathers and experienced decay [in the grave];