How are Americans over 80 years old different from Mensans? They have a 2:1 female-to-male ratio, while Mensa has a 2:1 male-to-female ratio. Similar situations occur for the top 0.1% society ISPE vs people over 100 with about 4:1 ratios, and for the Sigma-1 Society (upper 16%) group vs. people over 65, with 3:2 ratios.

Why do women live longer? Are guys that much smarter, or just more aggressive? Portsmouth New Hampshire is taking a hint from private schools showing much better secondary school results for all-girl math classes. They plan to start segregated classes next year. Some teachers say girls don't get enough attention and assistance in secondary math classes because the boys always demand more attention. (Where were these theorists when women were integrating the various all-male institutions around the country?) For longevity, experts recommend a waist-to-hips ratio of <0.95 for men and <0.80 for women.

Ratios

Group               Men       Women
ISPE Top 0.1% IQ     4          1   (3 Std Deviations above avg)
Mensa Top 2% IQ      2          1   (2 Std Deviations above avg)
Sigma 1 Top 16% IQ   3          2   (1 Std Deviation above avg)
Americans over 65    2          3
Americans over 80    1          2
Americans over 100   1          4