Psalm 90:10:
"The days of our years are threescore years and ten; and if by reason of strength they be fourscore years, yet is their strength labour and sorrow; for it is soon cut off, and we fly away."
It sounds like hitting 70 was no big deal 3000 years ago...
I think that it was determined that in olden time if one survived to age 5, one might live to a ripe old age. My husband’s people were poor farmers in southern Illinois. In the mid 1800’s, one ancestor had 9 children. Five died at the age of 2 in August or September. This was probably the result of weaning and bad sanitation in the hot summer.
I once got an old book which described famous Greeks and Romans 2000 or more years ago. I was amazed to see that the average age of death for the famous Greeks was around 70, but the average age of death for the famous Romans was around 50, and this was after I removed Romans who died of military activity. I think the Greeks had a much healthier life style, diet and enviroment, including no lead in their pipes, if they had pipes.