"The days of our years are threescore years and ten (70 years old); and if by reason of strength they be fourscore years (80 years old), yet is their strength l

"The days of our years are threescore years and ten (70 years old); and if by reason of strength they be fourscore years (80 years old), yet is their strength labour and sorrow; for it is soon cut off, and we fly away." - Psalm 90 10 Edit: Not sure why this would be down-voted. It's a quote from the King James Bible with a source reference that supports the notion that 70 years is about all the time we as humans have to live life in good health. It is relevant to the article as it lines-up with the 35 years old, "half of my life" claim as well. People do live longer than that, but quality of life and good health tend to go down a lot in the 70s.