> Most cavemen didn't live to see 40, Didn't they? Is that based on the median age, or the average? Because the average age tends to be skewed by infant mortal

> Most cavemen didn't live to see 40, Didn't they? Is that based on the median age, or the average? Because the average age tends to be skewed by infant mortality. > , and there's the little thing called evolution, too. The central argument is that our bodies haven't changed significantly in the time between "cavemen" and present day. So evolution is central to the argument of its usefulness. Whether it is correct that the evolutionary forces is relatively insignificant is, perhaps, up for debate.