'This Generation' in the Bible

And the Lord said to Noah, Take all your family and go into the ark, for you only in this generation have I seen to be upright.

You will keep them, O Lord, you will keep them safe from this generation for ever.

Now when I am old and grey-headed, O God, give me not up; till I have made clear your strength to this generation, and your power to all those to come.

For forty years I was angry with this generation, and said, They are a people whose hearts are turned away from me, for they have no knowledge of my ways;