"You'd think, though, that through millions of evolution that the human race would somehow mutate a gene that would produce a race that would have a longer than 70 year life span. I mean isn't "survival" the goal?”
No. The goal is to live long enough to have kids and care for them until they’re able to survive without us. There’s not a lot of selection for ‘old age.’
If we were producing offspring at 80, then we’d be breeding for 90 year olds.
But after maturity, our bodies go to shit, with no impact on evolution. Teeth fall out, eyes go weak, hair falls out, but the scorecard stopped when your last kid was born.
“Actually, it used to be in the hundreds and now has dwindled down to the 70's.”
If you accept the uncorroborated tales in the Bible… and if you also ignore the period when it WAS 30, so you can pretend science is not that big of a benefit.
"Let's speak worldwide and not old west days.”
Old West? How about most of human history.
“By your implication, live in the beginning would have to been measured in months or days and it's taken us millions of years to get to the 70's.”
Not at all, doofus. Every step of technology that improved our ability to acquire steady nutrition expanded on the lifespan. Mastering fire, better hunting methods and tools, dogs, and so on. But there’s no ‘implication’ that the progress was steady.
"A chart from the beginning until now would show that.”
A chart of life expectency would show long periods of static numbers, with instance of improvements. Like the practice of toilets not running into the water system, vaccinations, big improvements.
"Sure there would be ups and downs but the general slope of the graph would show either a constant upward slope or a downward slope.”
No, it would not.
“Second law of thermaldynamics (never could spell that) says what?”
Doesn’t matter, doesn’t apply to much of anything on Earth. And if it applied to our biology, it would prevent pregnancy from pdoucing babies.
