Blogger and computer science research assistant Randal Olson, who orginally created charts showing how men fell on the creepiness scale in regards to age, compiled two similar charts for women.
He wanted to display just how old or young women prefer their significant others to be as they age — and how their prefences compare to the "half-your-age-plus-seven" rule aka the Standard Creepiness Rule (demonstrated by the chart below).
For every person saying “just go for it and be happy,” there are realistic considerations. Yet soon after that, the slippery slope becomes 44 and 24, which can lead to Lolita situations and other felonies. If a man is 40, is dating a pair of 20-year-olds equivalent to dating one 40-year-old? From a brag and go high-five your friends standpoint, yes.
In the real world of dating, there are few actual rules. Half by seven may only be a guideline, but it is a useful one.
Besides, it offers more valuable insight than the alternative, which is to shrug the shoulders and ask, “Who the heck knows?
The late Tony Randall was 75 when he married his 24-year-old wife. Playboy founder Hugh Heffner has several girlfriends, most of them half a century his junior. The problem with this is that unofficial guidelines are exactly that.
Playgirl exists as well, and Elizabeth Taylor, Joan Collins, Martha Raye, and Cher all dated men decades younger than they were. So if 40 and 27 are acceptable, one could say that 41 and 26 are close enough.
The Half Plus Seven Rule is an unwritten rule that asserts that it is creepy to date anyone who is younger than half your age plus 7 years.
For example, a 50-year-old dating someone who is younger than 50/2 7 = 32 would be considered creepy.
For instance, you might want to know what the oldest age you could reasonably date would be.
The rule doesn't say anything about that, but it does also apply to the other person. We take away seven from each side to get $y-7=x \div 2$, and then double both sides to get y-14=x$.
Two things: the somewhat random-looking picture above is from The Moon Is Blue, a 1953 film that's the first known reference to the 'dating rule' discussed here.
Secondly, I don't make any judgement about the validity of the 'dating rule' - you might find it a useful rule of thumb or a ludicrous restriction; I find it a nice thing to do some algebra on.
There is a so-called rule about dating: the youngest age you are supposed to date is half your age plus seven.