Similarly, in his autobiography, George Arnold Escher (1843-1939, father of famous artist M. Escher) claimed that when he was looking for a wife ca.1880, he thought that the ideal ages for husband and wife at marriage would be if the woman's age was half the husband's age plus 10. Self-made graphic, with layout partially influenced by the PD image en:image: Half Plus Seven Graph 2.
Xkcd awkward dating age
From another point of view, the chart can be interpreted as saying that there should not be an age disparity of as much as five years unless the younger person has an age of 19 or more, a ten-year disparity should exist only if the younger person has an age of 24 or more, and a twenty-year disparity should occur only if the younger person has an age of 34 or more.
(And people only slightly older than 14 should only be involved with those almost exactly the same age as themselves.) To read the chart, go to the position along the x-axis which corresponds to your age, and the green range (between the black and red lines) directly above that position corresponds to the range of your partner's ages which is deemed acceptable by the rule.
For convenience, the line representing x=y is also shown (in blue).
The area between the blue and red lines shows where you are the older partner in the half-age-plus-seven calculation, while the area between the black and blue lines shows where you are the younger partner.
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