DaasYochid,
“Why wouldn’t it be? What would be a bigger factor?”
I don’t know, I think there are multiple potential factors, and I’d be glad to list some I think may be at play, with the caveat that it’s speculative. I think a subset of available men (full-time learners) are more prized culturally, so a larger population of women are trying to be matched with a smaller population of men from the outset. And the potential for a man to be matched decreases with age more slowly than for a woman.
The population growth rates being thrown around here, however, are inflated by an order of magnitude, and it is highly unlikely that a 2-3 year marriage age gap within this growth regime alone is the primary reason men get significantly more shidduch opportunities than women.