alterbochur,
Interesting thought, although I’m skeptical. I think it’s almost impossible to expect most 23 year old boys to agree to go out with a 27 year old girl.
Although NASI was quite successful at removing the stigma of a boy marrying a girl close to his age, there’s no reason, without artificial means ($), for those shidduchim to be preferred, so there’s still a significant age gap issue, albeit possibly less than before NASI.
The way I see it (and I have no inside info), this is an effort to encourage like-aged shidduchim, as advertised.
I’m sure they wouldn’t mind if there was an increase in the type of shidduch you describe, though.