The 1990 girl still will grow up faster, end up bigger, menstruate earlier, and live longer than the 1900 girl.
Girls now versus girls in the 1900s are basically the same. 
mnli hypothesis: Girls now versus girls in the 1900s are basically the same.  premise: The 1990 girl still will grow up faster, end up bigger, menstruate earlier, and live longer than the 1900 girl.