everyone who studied statistics on a collage level should be able to explain why this thing is misguided.
There was an article written by a mathematics professor with a Ph.D named Ariel Halpert (IIRC) which appeared in the Jewish Press (it’s since been removed from their website) explaining the shidduch crisis. You might be able to find it by Googling “ALL IN THE NUMBERS: A MATHEMATICAL EXPLANATION FOR THE ‘SHIDDUCH CRISIS'”.
Do you really believe that the ONLY factor is people not getting married is the age gap and if we “closed” then everyone who be married?
Of course not, otherwise there would be no older single males. Age gap merely explains why there are so many more older single females.