I don’t think he was referring to the age in which people start dating at all. The cause of the crises is that every girl coming out of sem wants to marry a learning boy and all boys are told to stay in learning forever and to look for a father in law who can support them. Tthis translates to that all boys (boys moms?) want a shver that can give money to keep them in learning with a comfortable lifestyle. which means more boys are marrying wealthy girls whose parents can support them which makes the rosh yeshivas happy because more boys than ever are staying in learning, and girls who’s fathers do not have the capabilities for support are not getting redt shidduchim. these very same girls should be looking elsewhere for shidduchim but instead many are unfortunately becoming older singles because the boys will not give them a yes and they refuse to think out of the box and realize the type of guys they’ve been told to marry their entire life are not interested in them.
Yes of course there are exceptions, but this is most certainly a man made problem by narrowing our community (kinda a bad idea huh) which can be fixed. it’s not a numbers problem.