The word "creepiness" is nowhere on that wiki page and I don't believe that creepiness is strongly associated with that formula attributed to Maurice Chevalier. To clarify what I mean by "associated", I'm talking about typical people holding both that formula and the "creepiness rule" as interchangeable labels for the same concept.
There is certainly some overlap between the two concepts but a 43-year old woman would understandably find a 73-year old chasing her a little "creepy" even though the she's within acceptable range of that math formula. Therefore, the "creepiness rule" is something else outside of that formula.
Another difference is the age/2+7 formula is a guideline for how society (the non-participants in the relationship) perceive the age disparity. The "creepiness rule" is more descriptive of how the participants perceive potential partners.
"The last-known Union widow, Gertrude Janeway, died in Jan. 2003 in Tennessee. John Janeway joined the Union army in 1864 and was briefly a POW at Andersonville. The couple married in 1927, after waiting three years until Gertrude turned 18. John was 81.
The person thought to be the last-known Confederate widow, Alberta Martin, was born Dec, 4, 1906, and died at age 97 in Alabama on May 31, 2004. In 1927, at age 21, she married William Jasper Martin, then 81. Martin joined the Confederate army in May 1864. Upon her husband's death, she married his grandson from his first marriage."
Looks like Western culture standards aren't cast in stone. Or made in heaven.
That's not how it's used in "Creepiness Rule". In this case, "rule" is a synonym for "heuristic" or a prevailing generalization[1].
But saying "Creepiness Heuristic" doesn't have that snappy and headline-friendly sound to it that the "Creepiness Rule" does.
[1]See definition #2 at http://www.merriam-webster.com/dictionary/rule