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Is it beneficial to my credit score if I close my youngest credit lines while preserving my current credit utilization rate?
Credit Score is rather misleading, each provider of credit uses their own system to decide if they wish to lend to you.   They will also not tell you how the combine all the factoring together. Closing unused account is good, as it reduced the risk of identity theft and you have less paperwork to deal with. It looks good if a company that knows you will agrees to give you more credit, as clearly they think you are a good risk. Having more total credit allowed on account is bad, as you may use it and not be able to pay all your bills. Using all your credit is bad, as it looks like you are not in control. Using a “pay day lender” is VERY bad, as only people that are out of control do so. Credit cards should be used for short term credit paying them off in full most months, but it is OK to take advantage of some interest free credit.