'Generation' in the Bible

His signs how great! and His wonders how mighty! His kingdom is a kingdom age-during, and His rule is with generation and generation.

And at the end of the days I, Nebuchadnezzar, mine eyes to the heavens have lifted up, and mine understanding unto me returneth, and the Most High I have blessed, and the Age-during Living One I have praised and honoured, whose dominion is a dominion age-during, and His kingdom with generation and generation;