The full version states: "if you halve your years then add seven, you'll have the youngest decent age for a partner; if you double your years then subtract seven, you'll have the oldest decent age for a partner".
However it's somewhat flawed thanks to the poor mathematical ability of its authors -- it gives a different result depending on whether it is worked out for a younger or older partner.
This trope is when a specific formula or calculation is proposed to determine either the "ideal" age gap, or the maximum allowable age gap before it becomes "creepy".
(One common criterion for compatibility between prospective marriage or romantic partners is the difference between their ages.
For the last 15 years of my life, i have been ignoring an entire market segment, namely those of the genus The Ragbag handily plotted out the socially acceptable upper and lower bounds for dates at various ages in the chart below: Notably, the chart also implies that there is a socially acceptable lower bound for your age: below the age of 14, by this rule, you shouldn't be dating at all.
Incidentally, if you're wondering how well is this rule adhered to in practice, the dating website has done an extensive analysis of age preferences amongst their members.
So the ripe old age of 14 -- the age when you still have pimples, are as insecure as can be and are unlikely to get anything more than a kiss from a woman your own age -- is the only time when you can enjoy dating a woman your own age? Add seven to that, so you can date a 12-year-old -- an older woman"?
According to internet lore, there's a mathematical equation that governs the lower bound for the socially acceptable age of a potential dating partner: half your age plus 7, or, in mathematical terms, if x is your age then the lower bound is f(x) = x/2 7. if you're 20, then the minimum socially acceptable age for a date is 17.I was having breakfast the other day with a friend who was giving dating advice to his son.For purposes of his anonymity, I am going to call just call him "Son." My friend said, "Son, you're 18 years old, so I am going to tell you how you date. As Society Marched On, this became less and less the case, and in modern works a very small age gap is often considered ideal, with a maximum allowable (as opposed to "ideal") age gap proposed, and often applied equally in either direction (older man vs. One commonly-applied formula is the "half your age plus seven" rule, in which the older partner's age is divided by two and then increased by seven to reach either the ideal or minimum allowable age for a romantic partner. Traditionally, a man was expected to be established in his career and lifestyle before marriage, whereas a woman usually transferred directly from her father's household to her husband's within a couple years of reaching adulthood, so it was considered ideal for the man to be at least somewhat older.