Hmm, that would explain why a lotta older guys would message me xD
I know I'm not an older guy, but I can understand why women in their 30s are like that--they want a stable man that they can hopefully build a long lasting relationship with. They don't want to worry about things younger people may worry about, like financial difficulties and guys that might be leeches (because to many, if you haven't at least made significant steps to reaching your goal by 30, it makes it look like you have no drive at all). I'm 27, and at this point, I don't want to date anyone that looks like they have no ambition or don't have a job, due to both me getting older and my ex being a financial leech on me. I'm not gonna say "oh you have to make 50k a year and be awesome off in your career", because I haven't even done that myself, but as we get older most people want more stability.
Now, I'm going to assume you're slightly overreacting a bit due to lack of message backs--few women are going to ask of THAT much of you, even if they put it in their profile--but they are going to be pickier when they're older, and certain seemingly small things (do you have a car? Is that your career, or just a job? Do you have a constant paycheck?) make a big difference.
EDIT: I realize I'm being rambly, I'm sorry. Lack of sleep.