Average Credit Age Calculator

Your average credit age is the mean age of every account on your credit report, and it is the most movable part of the length-of-credit-history factor, which as a whole is worth about 15% of a FICO score and also counts your oldest and newest accounts. Enter each account’s age in months below and the tool returns your average in years and months, flags your oldest and newest accounts, and simulates the two decisions people actually face: opening a new account, and closing the newest one. It is a history-length tool, not a score estimator: balances and limits matter to other factors, and the sections below point you to the calculators that cover them.

Quick Answer

How to use this average credit age calculator

You need one number per account: how many months ago it was opened. Everything else is arithmetic the tool does for you.

1. Get the opening dates. Pull your credit reports free from AnnualCreditReport.com. Every tradeline lists its date opened; use those dates, not your memory of when a card arrived.
2. Convert each date to months. (Current year minus opened year) times 12, plus (current month minus opened month). A card opened in March 2018 is 103 months old in October 2026.
3. Enter up to four accounts. Leave an age at 0 or blank to exclude that row. Blank, negative and non-numeric entries are treated as no account, so a stray typo cannot poison the average; if every row is empty, the tool asks for at least one account instead of guessing.
4. Read the trio and the what-ifs. The headline is the average with its band. Below it: your oldest account, your newest account, the average if you open a new account today, and (when you have more than one account) the average of the remaining accounts once the newest one stops counting.

One disclosure about the type menus: they are labels for your own notes. The calculator's math, like the scoring models it mirrors, uses ages only, because an account's age counts the same whatever type it is. Changing a type changes nothing in the results, and the article does not pretend otherwise.

How the average is computed, step by step

Add every account's age in months, then divide by the number of accounts. That is the whole formula, and it is worth seeing once with real numbers.

FICO's length-of-history factor actually looks at three numbers: the age of your oldest account, the age of your newest account, and the average across all of them, as myFICO's breakdown of what is in a FICO score describes. The average is the one most people can move, in both directions. Note what the formula ignores: balances, limits and payment behaviour live in other factors. Age works alongside them, which is why keeping balances low relative to limits matters too; our credit card usage calculator covers that 30% factor, and the credit card limit calculator sizes the headroom behind it.

Worked example: four accounts, checked against this exact tool

The calculator is pre-filled with these four accounts, and every figure in the table reproduces exactly when you click Calculate. Four more runs follow beneath it, so you can test the tool against numbers you can verify by hand.

The bands are this tool's own guidance, not FICO cutoffs, because FICO publishes none for average age: under 24 months reads Building, 24 to 59 Developing, 60 to 107 Established, and 108 or more Excellent. Treat the band as a plain-language summary of where the number sits, and the months themselves as the real output.

The dilution effect: why one new card moves the needle

A new account adds a near-zero age to the total while increasing the divisor, so the average always falls. It cannot do otherwise; that is arithmetic, not a scoring penalty layered on top.

With the worked example at 50.5 months, opening a fifth account today adds roughly 0 months to the 202-month total but divides by 5: 202 divided by 5 is 40.4 months, a 10-month haircut from a single application. The effect is harshest on thin files: one new account on a two-account file can nearly halve the average, while the same account on a ten-account file barely registers. This is the mechanical reason behind the standard advice to avoid opening several new accounts in a short window, especially before a mortgage application, where, as the CFPB notes in its guide to how a credit score affects a mortgage, the score you bring shapes both approval and price.

Closed accounts keep helping for up to 10 years

Under FICO models, a closed account in good standing keeps aging on your report for about a decade. Closing your oldest card does not delete its history the next morning.

This surprises most people, and it cuts against a lot of confident advice online. The account typically remains on your credit report for up to 10 years after closing, and FICO keeps counting its age the whole time, as Experian explains in its guide to how length of credit history affects credit scores. The real damage from closing is subtler: you lose the available credit, which can spike your utilization (a much bigger factor), and when the account finally falls off the report, the average drops then, years later, when you may have forgotten the cause. VantageScore models may treat closed accounts differently, so the exact effect depends on which score a lender pulls. The practical rule stands: never close your oldest card just to simplify, and if you must close something, closing the newest does the least long-term damage to the average: the calculator's second what-if line shows the average of the remaining accounts once that account eventually stops counting, up to 10 years later. The near-term effect of any closure is the lost available credit and the utilization change, not an immediate lift in the average.

FICO score factors at a glance

Length of credit history is the third-largest slice of a FICO score, and average age is its most movable component. The other factors still dominate: perfect age cannot rescue missed payments, and high balances hurt more than youth helps.

That ordering is also a work plan. If your average age is young but your utilization is high, the faster win is paying balances down: our credit card extra payment calculator shows what an extra monthly payment does to payoff time and interest, and every month you are not opening new accounts, your average age quietly repairs itself.

Honest limits of this tool

Three limits, stated plainly, because a number you trust too much is worse than no number.

• Four accounts maximum. If your report lists more than four accounts, this tool cannot take them all, and the average of a subset is not your report average: leaving out old accounts understates it, leaving out new ones overstates it. Treat a subset run as a rough estimate, and say so to anyone you show it to.
• Display rounding. Months are converted to years and months with the month part rounded to the nearest whole month. A 23.9-month average displays as "2 years" while its band is still computed from the exact 23.9 (Building), and the total-months line is rounded for display (fractional ages totalling 30.75 months show as 31). The underlying average, shown to one decimal, is always the exact figure.
• It is not a score. Scoring models are proprietary and weigh far more than age, which is why this page reports months and a guidance band rather than inventing score points. For an overall picture of where your file sits, our average credit quality calculator looks at the quality side of the report rather than its age.

What competing calculators miss

Search this keyword and you mostly find explainers, one tool measuring a different metric entirely, and this page. The gaps are specific.

• BraveCalculator's "average credit age" computes how many days a business takes to pay its suppliers (average accounts payable divided by credit purchases, times days in the period). Same name, completely different metric; useless for a credit report.
• YourAgeCalculator offers a credit age tool but headlines an unsourced "national average credit age of approximately 7.4 years" and tells readers closing a card hurts their credit age, without the up-to-10-years FICO nuance that changes the advice.
• LegalClarity and NumberAnalytics explain the formula correctly, then stop: worked examples on paper, nothing to run your own accounts through. NumberAnalytics works in whole years, which hides exactly the month-level changes a new account causes.
• Lexington Law and AxcessRent guides give solid FICO context but describe the average as one of open accounts; accounts closed in good standing keep counting while they remain on the report, which is the detail that decides whether closing a card is safe.
• The gap this page fills: per-account entry in months, the full trio (average, oldest, newest), both decision what-ifs with exact month counts before you commit, published band thresholds, and the tool's own limits (four accounts, type labels, display rounding) stated on the page instead of discovered the hard way.

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