Credit age is how long you’ve been using credit, and credit scoring models treat it as a meaningful ingredient in your score. Under FICO, length of credit history accounts for 15% of your total score, sitting behind payment history (35%) and amounts owed (30%) but ahead of new credit and credit mix.1myFICO. How Scores Are Calculated VantageScore 4.0 weighs it a little heavier, grouping it under “depth of credit” at 20% of the score.2VantageScore. The Complete Guide to Your VantageScore 4.0 Credit Score A longer history tells lenders you’ve managed debt across different conditions, and the number compounds quietly over the years.
What Credit Age Actually Measures
Credit age isn’t one number. Scoring models look at three related data points: the age of your oldest account, the age of your newest account, and the average age of all your accounts combined.3myFICO. How Credit History Length Affects Your FICO Score Together they give the model a layered view of your borrowing timeline instead of a single date.
Everything on your credit report feeds into those calculations: credit cards, mortgages, auto loans, and other credit lines. Each account contributes for as long as it appears on your report, whether or not it carries a balance.
How the Average Is Calculated
Add up how long each account has been open and divide by the number of accounts. If you have a mortgage opened 15 years ago, a credit card opened five years ago, and a card opened two years ago, your average credit age is roughly seven years and four months.4Experian. How Does Length of Credit History Affect Credit Score? The math uses the exact opening dates your creditors report, so a zero-balance card that’s sat idle for a decade still pulls the average up.
That’s where the tension in credit age shows up. Your oldest account anchors the high end, your newest account drags the average down, and everything in between fills the middle. One long-standing account can carry a lot of weight. Every new account dilutes it.
When You First Become Scorable
FICO can’t produce a score at all until you have at least one account that’s been open for six months, with some credit activity within the past six months.5Experian. What Is a Thin Credit File? Reports that don’t meet that threshold are called thin files, and lenders have nothing to evaluate. It’s a useful line to know, because people new to credit sometimes apply for loans before any score exists for the lender to see.
How New Accounts Change the Number
Every new account drops your average because you’re adding a zero-age account to the denominator. Two cards aged 10 years and 6 years give you an 8-year average. Add a brand-new card and the average falls to about 5 years and 4 months. The arithmetic is simple, but it rarely enters anyone’s mind at a checkout counter signing up for a store card.
The new application also triggers a hard inquiry, which stays on your report for two years and typically costs fewer than five points on your FICO score, with the impact fading within about a year.6Experian. What Is a Hard Inquiry and How Does It Affect Credit The age dilution lasts longer. It persists until the new account itself ages enough to blend in with the rest of your profile, which is why the real cost of opening accounts is usually underestimated.
Authorized User Status Can Help, and Can Vanish
Being added as an authorized user on someone else’s credit card can lift your credit age immediately, because the full account history appears on your credit report.7Experian. What’s the Minimum Age for an Authorized User? If a parent adds you to a card they’ve held for 20 years, that 20-year history flows onto your report and pulls your average up. Some issuers don’t add the account to the authorized user’s report until the user turns 18, so timing depends on the card.
Removal works just as fast in the other direction. Take yourself off the account, or get taken off, and it disappears from your report entirely, no longer counted in your scores.8Experian. Removing Yourself as an Authorized User Could Help Your Credit If your credit age was propped up by someone else’s old card, losing that access can hollow out your average overnight. Treat the arrangement as a bridge, not a foundation.
Closing an Account: Delayed Pain
Closing a credit account doesn’t hurt your credit age right away. If the account was in good standing, it stays on your report for up to 10 years after closure and keeps contributing to your average age during that entire window.9TransUnion. How Closing Accounts Can Affect Credit Scores That’s an industry practice at the major credit bureaus rather than a specific requirement in federal law.
The damage lands years later, when the closed account finally drops off. Picture a 10-year-old account and a 1-year-old account, averaging 5.5 years. Close the older card and the average stays near 5.5 years for up to a decade, then plummets when the closed account is finally removed.9TransUnion. How Closing Accounts Can Affect Credit Scores The closure felt painless at the time. The arithmetic catches up later.
Protecting Your Credit Age
The most effective thing you can do is keep your oldest accounts open and active. A small recurring charge once or twice a year on a card you rarely use is usually enough to prevent an issuer from closing it for inactivity. Issuers can shut down dormant cards, and while some will reinstate a closed account on request, you may face a new credit check in the process.10Equifax. Inactive Credit Card: Use It or Lose It?
Time new applications around major borrowing. If a mortgage is coming in the next several months, avoid opening new credit lines in the lead-up. The hard inquiry and the lower average age can combine to pull your score down at exactly the wrong moment. If no major loan is on the horizon, opening an account now gives it room to age before it matters.
And if authorized user status is part of your picture, use the time it buys you to build primary accounts in your own name. Those are the ones no one else can close or remove.