The phrase “three score and ten” is a biblical way of expressing the number seventy and is often used to refer to the typical lifespan of a human being. Additionally, the number seventy has significance in the Bible in regards to the cycle of sabbatical years, and the year of Jubilee.
The Bible has several references to “three score and ten” in various contexts. One of the most notable references is in Psalm 90:10, it states, “The days of our years are threescore years and ten; and if by reason of strength they be fourscore years, yet is their strength labor and sorrow; for it is soon cut off, and we fly away.” This passage expresses the idea that the average lifespan of a person is 70 years, but that some may live to 80 if they are strong.
In addition, the number 70 is also used symbolically in the Bible. For example, in Luke 10:1, Jesus sends out seventy disciples to spread the word of God. In Jeremiah 29:10, the Lord says to the Israelites that they will be in captivity in Babylon for seventy years.
In summary, “Three score and ten” is a phrase from the King James Version of the Bible meaning seventy, often used to express the idea of a full lifespan or the age at which a person may be considered old. The Bible mentions this phrase several times in reference to the lifespan of human beings, and also uses the number 70 symbolically in various passages.