Average Credit Age Calculator

Enter the total age of all accounts and the number of accounts into the calculator to determine the average age of accounts.

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Average Credit Age Formula

The following formula is used to calculate the average age of accounts.

A = T / N

Variables:

• A is the average age of accounts (years)
• T is the total age of all accounts (sum of each account’s age in years)
• N is the number of open credit accounts

To calculate the average age of accounts, add up the age of every open credit account on your report and divide by the total number of accounts. Credit bureaus measure each account’s age from the date it was first opened to the present.

What Is Average Credit Age?

Average credit age, also called the average age of accounts (AAoA), is one of three sub-components that make up the “length of credit history” factor in credit scoring models. The other two sub-components are the age of your oldest account and the age of your newest account. All three are evaluated together by scoring algorithms when determining how established your credit profile is.

Length of credit history as a whole accounts for 15% of your FICO Score and roughly 20% of your VantageScore (where it is combined with credit mix into a single “depth of credit” category). While it carries less weight than payment history (35% of FICO) or credit utilization (30% of FICO), it becomes the differentiating factor for consumers who already have clean payment records and low balances.

FICO vs. VantageScore: How Each Model Treats Credit Age

FICO and VantageScore handle credit age differently in two critical ways. First, FICO includes closed accounts in the credit history calculation for as long as they remain on the report (typically 10 years after closure for accounts in good standing). VantageScore may exclude some closed accounts, which can lower your average credit age unexpectedly after closing old cards.

Second, the minimum history required to generate a score differs. FICO requires at least one account to be six months old before producing a score. VantageScore can generate a score within one to two months of opening a first account. This distinction matters for consumers who are building credit for the first time or rebuilding after a clean slate.

Credit Age Scoring Thresholds

FICO does not publish its exact scoring buckets for credit age, but community analysis of FICO 8 score data has identified several key thresholds. The age of the oldest account appears to have a significant scoring jump at the 36-month mark, where consumers on otherwise clean profiles report gaining 20 to 30 points once their oldest account crosses three years. Average age of accounts is believed to follow similar step-function behavior at roughly six-month intervals, with small point gains at each threshold.

Among consumers who hold a perfect 850 FICO Score, the average age of the oldest account on file is 30 years, based on a 2019 FICO study. This does not mean you need 30 years of history to have an excellent score, but it illustrates how heavily weighted the longest-tenured account can be at the top of the range.

Average Credit Scores by Generation (2024 Data)

Because credit age directly correlates with how long someone has been borrowing, average FICO scores trend upward by generation. The table below uses Experian’s 2024 Q3 data.

Gen Z saw a three-point year-over-year decline in 2024, the largest drop of any generation, likely driven by rapid new account openings that dilute average credit age. Gen X remained flat, while Baby Boomers and the Silent Generation held stable in the “very good” range, benefiting from decades of account tenure.

How Opening and Closing Accounts Affects Average Credit Age

Every new account resets the “newest account” clock to zero and pulls your average age downward. For someone with a thin file (two or three accounts), adding one new card can cut the average age significantly. For someone with 10+ accounts spanning a decade, the impact of a single new account is diluted.

Closing accounts has a more nuanced effect. Under FICO, a closed account in good standing remains on the report for 10 years and continues contributing to the average age calculation during that window. The real damage happens a decade later when it falls off, potentially causing a sudden drop. Under VantageScore, the impact can appear sooner because some closed accounts may be excluded from the calculation immediately.

A practical rule: if your oldest account is a no-annual-fee credit card, there is almost never a scoring benefit to closing it, even if you no longer use it. Keeping it open preserves both your oldest account age and your average.

The Authorized User Strategy

Being added as an authorized user on someone else’s long-standing credit card can instantly boost your average credit age if the card issuer reports authorized users to the bureaus. The account’s full history, from its original open date, gets added to your credit report. This technique is commonly used by parents adding adult children or spouses combining credit profiles. Not all issuers report authorized users, so confirm this before relying on the strategy.

Why Credit Age Matters Less Than You Think (and More Than You Think)

Payment history and utilization together account for 65% of a FICO Score. A consumer with a two-year credit history, zero missed payments, and 5% utilization will outscore someone with a 15-year history who carries high balances and has a late payment. In that sense, credit age is a secondary factor.

However, for consumers who already have clean payment records and low utilization, credit age becomes the primary lever available for further score improvement. It is the reason many people plateau in the 740 to 770 range for years before eventually crossing into the 800+ territory. Time is the only variable they cannot accelerate.

One underappreciated dimension: credit age also affects which internal “scorecard” FICO assigns you to. FICO uses hidden scorecards that segment consumers into groups based on profile characteristics. Crossing the 36-month average age threshold, for example, can shift you from a “young file” scorecard to a “mature file” scorecard, where the scoring weights for other factors change. This means the same utilization percentage can produce different point impacts depending on your credit age bracket.

Negative Items and the Seven-Year Rule

Most negative items (late payments, collections, charge-offs) fall off a credit report after seven years from the date of the original delinquency. Bankruptcies can remain for up to 10 years. When a negative account drops off, it may also remove an older account from the age calculation, which can paradoxically lower the average credit age even as the negative mark disappears. Consumers should plan for this by having other long-standing accounts in place before a seven-year removal event.