If you know your ancestors back to before the Revolutionary War and wonder whether they had royal ancestry, here's a good book: Royal Descents of 600 Immigrants to the American Colonies or the United States, by Gary Boyd Roberts.
http://www.americanancestors.org/Product.aspx?id=21787 Your library may have it.
The show didn't mention that most royal and "noble" lines are pretty well known, while others are not. By the time you get back 10 generations you have a lot of ancestors. When they followed (say) Valerie Bertinelli's line back, the chart had a lot of spouses with no ancestry listed. Out of thousands of ancestors at a given generation, it's not surprising to find a prominent one. A large proportion of people with European ancestry are descended from Charlemagne, a.k.a. "Chuck the Prolific."
maraleia, marriage age in the US varied geographically. In New England, brides were usually at least 20. In some parts of the south, age 14 was not unusual.
Ancestor names: One of mine was a doctor named Comfort Starr. Good name for a doctor.