I asked a question relating to this on yahoo answers and here is an answer that a woman actually posted:

"well if you still feel emotionally immature
it is probably better for you to date immature girls as well
in their early 20s
you probably couldn't handle mature women
so stick to the ones you can handle"

It is so hilarious how they resort to passive aggressive comments like this in some cases because they are just so hateful and intolerant that they can't just accept a man wanting to date a young woman as being perfectly ok. I truly think that usually these are women who are jealous of younger women and want to see men only dating women their own age or older. This is why even a 27 year old dating a 22 year old is problematic to them.