How to understand Psalm 90: 10 Our life span is seventy years?

In fact, that is to say, our life in the world is limited and very short, and our physical strength is only 70 or 80 years. . As Jacob said to Pharaoh in the Bible: I have lived as a stranger for 130 years, and the days of my life are few and bitter ... That is to say, since life is so short, we should seek the "life" that will never die, that is, eternal life. Therefore, we should accept the salvation of the Lord Jesus Christ, take the road of eternal life, obey the Lord and listen to his teaching, so that we can enter the kingdom of heaven and live forever.