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The problem is that both the equation "y = x", which just maps age over time, and "y = x / 2 7", the dating-range formula, are each linear, an so at a certain point the lines grow unrealistically far apart, like where a 60 year old can date a 37 year old.
When thinking about it, I figured what you'd want is some kind of curve that had an asymptote parallel to y = x, that way ages wouldn't become unrealistically far apart. What's wrong with a 60 year old dating a 37 year old?
Downloading the excel file at A1-all.xls, we can continue the analysis and replicate Randall's findings.
I edited the data found in the csv file to compute the age pools of singles by considering that the "single person" category is the union of the categories "Married Spouse Absent", "Widowed", "Divorced", "Separated" and "Never Married".
(And now we see why the last panel of the XKCD comic above applies so well to me…) Sure enough, if we overlay Rudder’s Ok Cupid data over the first chart, we see that men follow the rule almost exactly.