I can tell by the smarmy style in which it is written that it is all a load of crap. People were not often living into their 70s. I would not trust this source for any conclusions about anything
Psalms 90: "The days of our years are threescore years and ten; and if by reason of strength they be fourscore years..."
Apparently they were making it to 70 with some regularity during Biblical times, if King David is to be believed.