But yehudayona’s point may explain it: Women tend to outlive men so they’re single when they’re older after there spouse and other older men passed away, thus skewing figures showing more unmarried women than men.
Though with this large a disparity I don’t think that fact could nearly explain it all. In which case the frum communities own disparity on this point may simply be part of the larger natural similar general statistic in the world population, rather than being explained primarily due to an age gap. (In the sense that an age gap is any different than general society or otherwise a natural occurrence of marriage.)