Before I showed that the average porn star is 23 years old, judging from LA Direct Models, which represents the more famous ones. The average beauty pageant winner in recent years is 21, though. (And of course, sex symbols have been getting steadily older for as long as we have data.) So now let's look at a group of women who are also chosen almost entirely based on looks, though probably for having a daring and calculating personality too: prostitutes.
I happened upon this data after reading an NYT article on how the global recession is affecting demand for Czech prostitutes. The brothel profiled allows guys to pay an entrance fee and have sex with the women there, who get paid wages plus commission per act. They're filmed for an internet audience, whose subscription fees provide the brothel's revenue. Here is their website's list of girls. From this list, we get the following distribution of ages:
The average girl here is 24 (median 23.5), and the distribution is highly skewed (skewness is +2.96 S.E.). That is, most of the girls are in the lower end, with just a few in the upper end. No surprise there: younger is better, even when almost everyone is under 35. And look at how many are 18 -- about 11%. If you imagine what the graph would look like with ages 15 to 17 included to the left, it's obvious that those bars would not have negligible height -- and certainly not zero height. There is clearly a big demand for girls that age. After all, that's why there are laws against under-18 prostitutes: finding no minors at all among prostitutes is not a situation that would happen naturally in a libertarian society.
In fact, for 16 and 17 year-olds the bars would probably stand taller than those of the over-30 women. I'm going to sell motivational posters for over-30 women who are still "exploring their options" on the dating market: it'll be a stern-faced picture of me, and under it, "You were hotter in high school. So settle already." Take a lesson from your treasured retailers and think up some sort of "buy one, get one free" offer involving your enabler -- er, best friend -- to make sure you get married to someone before your assets evaporate.
Lastly, it's interesting that the beauty pageant winners are quite a bit younger than porn stars and prostitutes. One misgiving I have about chasing teenagers is that, as tight as their skin is, and despite their indefatigable energy level, their asses can't compete with those of a girl who's about 23 to 24. These girls have more raw fuckdoll appeal than the younger ones, who specialize more in being cute and enchanting.
A girl who's 23 is at or near the age when the average woman would've had her first child in most places and times for our species. So, she's the one you want a one-night stand with: she's decided to have a kid, and all you need to do is be there and leave some other guy to raise it. To get her for a greater length of her salad days, like before 23 as well as during her mid-20s, you have to invest more in her, since she's not quite as promiscuous as she'll be in a few years. Because guys would rather not invest anything, they must be tricked and manipulated into doing so -- and youthful charm, plus super-firm flesh, is one of the few weapons that young girls have to get past a guy's resistance to commitment.
(Again, a note to any women planning to go husband-hunting after 30: it's like trying to rob a bank with water gun.)