Tzippi: I don’t know what community you are referring to.
However allow me to explain the relatively ovbiuous thought procees behind such a plan.
They have many many single girls. They are bringing in a shadchan to meet the girls. The shadchan can not focus on all the girls at once. Sounds like it makes a lot of sense to have the shadchan only meet the slightly older girls. They are not preventing the younger girls from dating, they are simply trying to get extra help for the slightly older girls.
Seems like it makes sense to me.
And yes I am a big believer (as are many many R”Y) in giving boys reasons why slightly older girls are objectively better matches for them than the very new sem girls. Is that preventing anyone from getting married??, or just helping out the slightly older??