Seems like we have gotten a bit of topic here. (it’s not kavod to squeak who opened the thread)
SJSinNYC:
“encourage bochurim to marry those who are close to their age (and even older),”
clearly the emphasis is on marrying close in age. Obviously marrying 30 yr old girl helps that girls in particular (as well as the age gap in general), however that wasn’t the gist of the letter.
regarding you questions on the math. I didn’t see a specific question that debated either of the 2 basic pretty self evident premises.
1. Population Growth
2. Age when girs/boys start dating.
You suggested that there are more girls born the jewish community but that is not substationated by class sizes of girls schools vs. boys schools.
What other issues do you have with the 2 premises?