However, as girls naturally mature intellectually and emotionally, their taste in men (sometimes) matures as well and they value other aspects and characteristics in a partner than they used to.

That's what I said, except I called a spade a spade and I'm saying that causation is correlation in this case. Girls get older, become aware of the transient nature of their beauty, so they "mature"... "emotionally". Or less charitably, they start losing power over men and they start losing options and they start accumulating damage from bad relationships, so they settle for some guy they never would have looked at twice when they were younger.

It means that what they're looking for in a relationship changes and the type of guys they look for changes with it.

Yup, that's what I said, only I'm not being vague. What they're looking for changes because their circumstances change.

I figure you're most likely one of those guys who "gets friendzoned" a lot and thinks girls only like assholes and can't understand why they don't give guys like you a chance when you're such a "nice guy".

I'm coming off as a nice guy who gets friendzoned? And I didn't say they only like assholes. From the message you were replying to:

Women go for all kinds of guys including assholes

Where we disagree is on the reason women change. You're being vague and I'm saying it's because their options start narrowing because their looks are fading and they're just looking out for themselves, same as when they were 16 or 21.