Best segulah. work to CLOSE THE AGE GAP by encouraging more close in age shiddchim. It is the source of the problem. Not only would this be a segulah beacuse “Kol Hamispalel bi’ad chaveiro vi’hu tzarich li’oso davar hu ne’na techila”, it’s is also the natural solution to the problem.
Stay tuned to a letter from numerous roshei yeshiva to this effect.