'Forty five' in the Bible

Suppose the fifty righteous are lacking five, will You destroy the whole city because of five?” And He said, “I will not destroy it if I find forty-five there.”

Now behold, the Lord has let me live, just as He spoke, these forty-five years, from the time that the Lord spoke this word to Moses, when Israel walked in the wilderness; and now behold, I am eighty-five years old today.