I've thought about this and I'm totally fine with the model as is. Maybe it would have been nice to have a couple more lines to age her a little; but Daz is difficult and I can roll with the fantasy. I mean, it's like how Lexi Belle (yes guys, I've watched porn too) spent like five years of her career playing 18 year old school girls, just roll with it. But Sophia's age creates all sort of inconsistencies that my OCD brain can't accept.
That isn't specifically addressing educational attainment. Here's a nice article from the NYT that discusses the gap in births and educational attainment.
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But the important tidbit for our discussion is that the average age of a first time mom with a college degree or higher is 30.3 years.
The driving force behind the overall increase from 21 to 26 is that the percentage of women pursuing higher education has exploded since the 70s. An emerging demographic trend is how lopsided college enrollment and graduation rates are towards women. More women are applying for college than men, and more of those women are finishing their degrees than their male counterparts. This goes hand in hand with women waiting longer, and having fewer children, as their educational attainment increases.
In 1980, 13.6% of American women had a bachelor's or higher. In 2000, it had increased to 23.6%, and in 2020 it was 38.3%. Since 2014, women with a bachelor's or higher have equaled or exceeded men. This increase in educational attainment is causational to the corresponding increase of a women's first birth that you noted.
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Again, we're waaaaayyyyyy into the weeds on this one and I apologize to everyone that comes here looking for "Is moving!". The point simply is that, even in 2000, Sophia would have been a statistical anomaly. That doesn't make it impossible, just highly improbable.