<prompt> Human: I got my first credit card when I was 17 only because my parents co-signed on the account with a limit of 500. Im 23 now and I still have the same account, parents are still on it. About 3 years ago my limit was increased to 3,500, and recently it was increased again to 7,500. My parents are concerned that this will negatively affect their credit score. Does anyone have experience with this?  <response>: Actually a higher credit limit will tend to lower your utilization percentage and that is good for your credit score. 