5"11". It can be noted that each generation in the US is on average an inch taller than the previous generation. My first reaction to this was that perhaps it's due to improved (or at least different) nutrition, but in fact it seems to be due to selective breeding. Studies show that in any generational cohort the taller men are not only more likely to have children than the shorter ones (apparently due to preferential selection by females), but interestingly also, the tallest of the men who have children seem to have a larger number of children than the somewhat shorter ones who have children. Perhaps this is biological in some way, perhaps the women who want the most children seek the tallest men, perhaps the taller men themselves want the largest families.