It's a blog.
This comic was pretty funny, and the age/2 + 7 formula got tossed around a lot by my roommates.
Of course, it gives us the minimum age one can date without being creepy. At 22, it’s [(22/2) + 7], or 18. (I, however, maintain that this discrepancy would, in fact, be creepy.)
But what about the upper age limit? The formula itself is silent on this, but we can easily do some substitution to make it work. If the minimum acceptable age (“M”) is your own age (“A”) divided by two, plus 7, we get:
M = A/2 + 7
We typically solve for M, knowing A. However, the oldest person I could date would have my A as their M, e.g.:
22 = A/2 + 7
With this realization, it’s a simple Algebra 1 question. Subtract 7 from both sides and then multiply by two.
Thus, the maximum age one can date is 2(a-7), where a is your age. For me, it’d be 2(22-7), or 30.
What interests me, though, is that this means I’m allowed to go back four years, but forward eight, within the margin of creepiness.
I built a spreadsheet for people aged 1 to 100 showing this and various other statistics. It’s online here as an HTML document. A few interesting trends emerge that aren’t intuitively obvious working with just the formulas: