it used to be men could marry two wives, so even though men marrying younger girls resulted in more girls than boys, since some boys took two wives things evened out. now (for a long time by european jews and more recently for sefardic jews) that men cant have two wives we need to figure out what to do about their being extra girls in the shidduch market. either boys gotta marry younger, closer to the age girl marry or (harder and less likely) we go back to the old system where some guys take two wives.
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