Frenchy, that's a fairly ... stupid reading of who and what the Scots-Irish were and are. Read Twain's "Life on the Mississippi" and also "Roughing It" (to see Scots-Irish out West). 
 
For Scots-Irish, the dominant need is freedom. Being their own man. This often leads to violence when various groups come into conflict in rough environments. Such as the wars with natives in places like Georgia, Alabama, etc. or in Wyoming, New Mexico, or Arizona. 
 
Family is often the only barrier between disaster or success, but many notable Scots-Irish were essentially Orphans. Such as Andrew Jackson. 
 
The Mountain West is just as well a good representation of the Scots-Irish as Appalachia. Personal independence is generally the main concern.

Well, if I'm looking at beautiful actresses of Jewish ancestry, off the top of my head I would include: 
 
Sarah Michelle Gellar 
Michelle Trachtenberg 
Alona Tal (Israeli) 
Yasmine Bleeth (before cocaine) 
Laura Prepon 
Amanda Bynes 
Rachel Bilson 
Scarlett Johansson 
Ashley Tisdale 
Evan Rachel Wood 
Shiri Appleby 
Elizabeth Banks 
Amber Benson 
Elizabeth Berkeley 
Jennifer Connolly 
Soleil Moon Frye 
Leah Remini 
Sarah Silverman 
Alicia Silverstone 
Jennifer Jason Leigh 
Rena Sofer 
Amanda Peet 
 
From Wikipedia 
 
That's a pretty good list. I'd put their beauty against anyone's. Instead I would go with small sample size for King Henry, and also some fairly brutal living conditions in urban medieval environments. Disease and lack of sanitation can make many ugly.

Trajan23, that is because most entertainment is by and for women. Selling them fantasies that they're still hot and desirable as a 20 year old at age 40 or older. 
 
One of the publicity stills for the Sex and the City movie has Sarah Jessica Parker, in some ridiculous dress, looking stringy, with an "in-love-with-herself" look on her face, being gaped at in awe by a bunch of much younger, hotter women passing by on the sidewalk. 
 
That is the fantasy. 
 
I'm shocked no one has commented on the most OBVIOUS reason for the increase in ages for Playboy Centerfolds, Miss America, and most particularly porn stars. 
 
What happened in the 1980's to drive up the ages so dramatically? Why, Ed Meese, his commission on pornography, crusades against porn in Congress and the media, and the infamous Traci Lords incident (she worked as a porn star while way under 18). Thus the incentive for porn makers to choose women who were never in doubt as to being well over 18. 
 
Similar pressures being brought to bear (obviously not as extreme) on Miss America and Playboy would also skew things, far from demand, but rather from a legal liability standpoint. 
 
You can't discuss American culture without discussing how legal penalties shape things. I doubt men stopped liking hot young chicks, and got preferences for older women, rather penalties for providing anything even hinting of that nature were so severe that every provider played it safe. 
 
Certainly the evidence suggesting that in teen pregnancies, the fathers were about 6.7 years older on average (IIRC, don't have the cite, just working from memory here guys) does not indicate a preference for older women.

Perhaps blonde hair signals young? Children may have tow-head hair, then become brown haired as adults. 
 
Thus, blonde hair might have that advantage of signalling youth. 
 
Other aspects might be standing out from other women, see also red hair.

Let me add, there could well be some social disruptions as the Betas try and rejigger things their way. There's more of them than the Alphas. They are good at tool-making. A whole lot of unattached men, without much hope of a wife (generally a woman no older than thirty, with fertility and some youthful beauty, and without a lot of sexual history / relationship baggage) has never been a healthy development. 
 
China's periodic rash of riots, revolts, and rebellions, like the Taipeng Rebellion, that killed 20 million with ... muzzle loading muskets, is a sign of what can happen. Or it's wobbly uncertainty and periodic riots (suppressed in the media) today. At some point, the out-group of Betas realizes "hey if we storm the castle, WE can have all the women." Much social disruption ensues. That dynamic is probably the real driving force behind many insurgencies, like FARC, etc.

Weird. I just posted on this. 
 
You can see it here. 
 
Basically, women want high-testosterone, socially dominant men who are bigger and stronger than the competition, if there are no penalties for that strategy. If there are penalties, they will shift to the "Beta Male" who ought to be called the tool-maker. Focused on abstract tasks, fascinated by how things work, and can be improved, system-oriented, often "smart" in manipulating or understand tools. Tool-makers are the evolutionary "edge" of humanity. Other species makes a few odd tools, humanity makes and continually improves tools. To extract the maximum amount of resources from an area and beat the competition (other human groups). The society with the most and best tool-makers generally wins also. 
 
Now, with the Welfare State, the pill and condom, random, anonymous urban living (see Roissy's blog for more on that) there is no downside to choosing bad boy after bad boy. Britain's illegitimacy rate is 50%, most of Northern Europe including the Scandinavian nations, the Netherlands, France, and Belgium, Germany, and Switzerland either exceed that figure or approach it. The Black illegitimacy rate is 70% nationwide, and 90% for the urban core. In 1965 the rate was about 24% or so. The white rate in 1965 was about 4%, compared to about 34% nationwide now. So big, massive social changes in how women choose men have taken place in 40 years or so. Women are choosing not to get married in the first place, and chase after bad boys. Dark Triad indeed. 
 
Another tragedy of the commons. Gobs of fatherless boys running around, seeking to be the baddest bad boy in the neighborhood because that is what gets rewarded. Women seem to avoid men who are "smart" because it seems to correlate with lower testosterone levels.  
 
Up until now, women who did not choose the nerdy tool-maker tradesman, or merchant, or what have you had the choice of prostitute, disposable mistress of a rich aristocrat, or wife of impoverished soldier. No wonder nerdy guys are all over the place in the West, and pretty absent in a lot of other places (like say, Mongolia or Saudi Arabia). Until recently, the Beta male had no problems reproducing. 
 
For people who think talent, ability, and interest in tool-making does not just appear like "magic" in people out of the Ether, but is inherited, what's at stake is nothing less than the West's comparative advantage and entire social basis.