27. Card is a little over 2 years old. It is my only credit card. The only other line of credit I have out right now is my car payment which I have never been late on and have paid more than the regular payments for a few months now. Other loans that I have since paid off were all my student loans. I took care of those within 6 months of graduating but that was back in 2003.
I have asked them to increase my limit but they said that they review accounts on a periodic basis and make the determination then and they cannot do it at my request. I think that is a bunch of bullshittery, but that is what I was told.
Since your card is relatively new you don't have a huge track record to go by although it is good that you cleared out your student loans. Did you say you tried applying for another card? I'd try for another card and would negotiate with them. Tell them how much you're looking for, what you're willing to go for on the rate etc. Then take that and hold it over your credit card companies head and tell them you're pretty much ready to bail. They are hurting right now and can't afford to lose customers.