This is a theory. It isn't based on any stats or anything but more a general observation based on real world experience and knowledge of pop culture and news. But, what the situation is is that we (mostly men but also some women) on what women are like from 18-21 and not what they are like once they've, you know, actually matured.
I mean, you can see it by the verbiage we use. Even on this site we refer to all women as "girls" (girls ask guys.) it seems innocent and unimportant, but it frames our minds. You would never call a 30 year old woman a girl but you'd call a 20 year old woman a girl. As such by using girl as a term for all women you are framing them all in this 18-21 year old bracket.
But aside from just verbiage, let's look at some of the things we ascribe to women in general:
-women feel degraded by sex and generally do it because they feel its a duty to their guy
-women like "bad boys" or guys who are confident yet jerks/aholes
-women are obsessed with six packs and huge dicks
-women value athletes and men with lots of money
-women will actually refuse to go on a date with a guy because he's short
Now, what does this remind you of? Oh yes the girls you met IN HIGH SCHOOL. Christ, by college women are usually growing out of these above things. And yet, look at any guys take or question and it usually assuming one or all of the above are true. Yes, size matters A LOT to women in their youth, yes the size of your bank account matters to women who are young or never grew out of their youthful desire to only go with guys who can take care of her most superficial desires, and yes when you're in school being a sports team makes you very attractive.
Now you might say well i know plenty of 30 year old women who still care about these things and they're pretty hot! And to that i'd say yes but you're assuming all women mature just because they get older. I'd disagree. And you realize that those 30 year olds who you say are hot compared to other 30 year olds are trying to look 21? Do you really want a woman like that? Do you realize what that looks like at 40 and beyond? They never let it go, they never grow up...
So, I say we need to reframe what we ascribe to women at large. If you do want to say a general statement about women, consider how the older ones feel as well as the younger ones. Maybe part of the problem is that guys STATISTICALLY prefer 18-21 year old women by a far margin regardless of the age of the guy.
But that's beside the point. What I do know is that no woman above the age of 26 sees the world in such crass terms. Sure, they may have remnants of their youthful mind prompting them to value one guy over another for the wrong reasons but this is not a significant thing. Mostly, it's mostly in guys' minds and, again, maybe that's because deep down inside men want women to be 18-21 forever...