With some quick math, the rule provides a minimum and maximum partner age based on your actual age that, if you choose to follow it, you can use to guide your dating decisions.The utility of this equation is that it lets you chart acceptable age discrepancies that adjust over the years. Let's examine it: How well does the rule reflect scientific evidence for age preferences?

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For rule-related involvement (e.g., relationships), 60-year-old men are stating that the minimum acceptable age is around 40ish, which does map much more closely to the rule’s predictions.

Men’s preferred partner age: The rule states that you can calculate maximum acceptable partner ages by subtracting seven from your own age and multiplying it by 2.

Figure 2 clearly shows that the rule’s max-age guidelines for men do reflect real-world preferences.

The rule overestimates the perceived acceptability of men becoming involved with older women.

Now we can see how well the rule corresponds with people’s reported acceptable ages.

Men’s preferred minimum partner age: Let’s start with minimum age preferences reported by heterosexual men.Women’s preferred maximum partner age: Examining maximum preferences, again the rule is more lenient, offering an age range with which most people are not comfortable.The rule states that it is acceptable for 30-year old women to date men who are up to 46 years old, but in actuality, 30-year-old women state that their max acceptable partner age would be less than 40 (around 37).Men do not show a linear increase in maximum age preference that matches the rule’s predictions.Instead, men report maximum acceptable partner ages that hover around their own age through their 40s.By the time of their separation in 2011, however, Kutcher, then 33 had crossed the minimum threshold (31.5) defined by the rule. Curious outsiders are quick to judge when they can see a wide age gap between two romantic partners. In a world in which many social norms are often unspoken, the half-your-age-plus-7 rule concretely defines a boundary.