Question: what is the significance of 70 years in the bible?
Answer: Seventy elders were assembled by Moses on God's command in the desert (Numbers 11:16-30). Psalm 90:10 allots three score and ten (70 years) for a man's life, and the Mishnah attributes that age to "strength" (Avot 5:32), as one who survives that age is described by the verse as "the strong".