I’d tend to agree it’s worth studying. We really don’t understand this stuff. Unfortunately the political football aspect makes that hard. The age of girls hav

I’d tend to agree it’s worth studying. We really don’t understand this stuff. Unfortunately the political football aspect makes that hard. The age of girls having their first periods is like 5% younger, while regular cycles are taking longer to start. I don’t have the data at my fingertips, but my understanding is that different cohorts have very different results with respect to this.