Spare us the falsehoods from your Footsteps board members. The OTD claims presented have no basis in reality.
As far a the general age gap issue, I’m not sure you can be effective in convincing Litvish boys to marry younger or convince them to marry older girls (than they currently do) unless and until the Yeshivish oilem adopts the Chasidish type Shidduch process.
In Eretz Yisroel the Litvish Shidduch process is closer to the Chasidish system than it is to the American Litvish system.