Exactly this. Any study done shows that the crisis does not exist.
I think Ami also had a study showing there's no crisis.
Totally anecdotal, but when I was in Monmouth hospital maternity ward, I asked around, and they said there's noticeably more boys being born to the Jewish community.
I honestly don't know if there's a crisis, and if the age gap is the answer, but to not do a serious study, seems insane.