Why does closing my oldest credit card hurt my score?

Closing your oldest card can ding your score in two ways. First, length of credit history matters, and your oldest account anchors your average account age — closing it (and eventually losing it from your report years later) can shorten that average. Second, closing a card removes its credit limit, which raises your overall utilization ratio if you carry balances elsewhere, since you now have less available credit. The fix is usually to keep old no-fee cards open and active with a small recurring charge, like a streaming subscription, paid off automatically each month. If the card has an annual fee you no longer want to pay, ask the issuer to downgrade it to a no-fee version instead of closing it, which preserves the account history. Only close a card when the fee or temptation truly outweighs the benefit.