I think also they're confusing life SPAN with life EXPECTANCY. Human lifespan probably hasn't changed in hundreds of thousands of years.
And I doubt the average Greek polis would have had compulsory military service until age 50 if the typical lifespan was 28.
"Human lifespan probably hasn't changed in hundreds of thousands of years."
Oh, yeah? What about those Old Testament dudes? Let me refer you to a couple of Young Earth Creationists. They'll set you straight. [grin]