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Half-plus-seven acceptable partner age range formula
Formula for the acceptable partner age range at age n: lower bound is the greater of n/2 + 7 and a cultural minimum age, upper bound is 2n − 14.
For ages $n \geq n_{\min}$ (cultural), acceptable partner ages fall in $\left[\max!\left(\frac{n}{2} + 7, n_{\min}\right), 2n - 14\right]$.