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It takes me a very long time to write the future predictions for the characters and I'm sorry for that. Unfortunately, they take up quite a bit of my time because I don't want to throw just anything together. I want the predictions to be fairly plausible with enough detail that people reading might learn something about the time period under discussion.
And of course I'm always learning. None of us are truly experts at things-more information comes to light or is brought to our attention. History is my passion and I spend a lot of time reading biographies and books about the lives of women (currently reading Stacy Schiff's new book on the Salem Witchcraft Trials). But despite my life long interest in the subject, I still learn.
For example, my understanding of life expectancy has become a bit more nuanced. Neth from American Girl Outsider pointed out to me after my Felicity and Elizabeth prediction that I was using life expectancy statistics that predicted life expectancy at birth. Since a major factor in low life expectancy in the past was child mortality (which is defined as children dying before the age of 5), that statistic wouldn't really apply to Felicity and Elizabeth who we know were 9 at the start of the series. Therefore the dismal life expectancy of 36 doesn't really factor in. In other words, while it is plausible (if depressing) that Baby Polly died very soon after the story wrapped up, that wouldn't have such an impact on Felicity and Elizabeth.