Older women more likely to have girls?

Here is the original study that some of that info that NBP posted, was based on. There are a lot of assumptions made about the reasons why which are probably crap, but it's the numbers themselves that are of interest.

Determinants of the sex ratio at birth:... [Soc Biol. 1988 Fall-Winter] - PubMed - NCBI

4 girls before i was 23...........