They don’t go to seminary at 18 or 19 – they go at 17 or 18 and come back at 18 or 19 and start dating as soon as they come back. Most start right away. The ones that wait usually only wait a few months, so they are rarely older than 19 unless they were held back. Even the ones who were held back usually don’t turn 20 until sometime b/w September and December, and since they have been home since June, they still will start dating before they are 20. And those girls are less likely to wait.
In my day, it was unheard of to pass your 20th birthday and not be dating yet. I was the only one I know who did that (besides for maybe one other girl I knew whose parents didn’t allow her to start dating before she was 20, and I thought they were nuts).
It is possible that it is slightly different today and that you might find some girls in the US who don’t start until they are 20 but that is still not the norm (at least not in those circles which are the American equivalent of the Israeli circles
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