Length of Credit History Explained: Why the Age of Your Oldest Credit Account Affects Your CIBIL Score (2026)

By Nitish Bharadwaj · Published Aug 9, 2026 · 6 min

Length of credit history is one of the core factors behind your CIBIL score, alongside payment history, credit utilisation, credit mix, and new credit inquiries. It reflects both the age of your oldest account and the average age across all your open accounts — a longer history gives bureaus more data to judge repayment behaviour on, which tends to support a stronger score. Closing your oldest card, even one you barely use, can lower this average and dent your score more than expected. This guide explains how it's calculated and when closing an old account is still the right call anyway.

Two loan applicants can have identical on-time payment records and identical credit utilisation, and still land on different CIBIL scores — because one has been using credit for eight years and the other for eight months. Length of credit history is one of the quieter factors behind your score, rarely mentioned until the moment you're deciding whether to close an old credit card. By then, the account you're about to shut may be doing more for your score than you realised.

What Length of Credit History Actually Measures

This factor looks at how long you've held credit accounts overall — most commonly tracked as the age of your oldest open account and the average age across every account currently open in your name. Bureaus weigh it because a longer track record simply gives them more data to judge your repayment behaviour on; a borrower who has managed credit responsibly for a decade carries a demonstrated pattern that a six-month-old file can't yet show, even if the recent behaviour looks identical on paper.

Oldest Account Age vs Average Account Age — Two Different Numbers

Bureaus typically look at two related but distinct numbers within this factor. The first is simply how old your single oldest account is — a credit card or loan you've held the longest, even if it's rarely used today. The second is the average age across all your currently open accounts, which moves every time you open a new one. Opening five new credit cards in a year doesn't erase the age of your oldest account, but it does pull your average account age down sharply, since each new account starts its clock at zero.

Why Closing Your Oldest Card Can Lower Your Score

Closing a credit card removes it from your average-age calculation once it drops off your report, which can quietly shorten your overall credit history even if every other account stays untouched. This is the specific reason credit advisors often recommend keeping your oldest card open with occasional small spends rather than closing it purely because you've stopped using it actively — our guide to closing a credit card without hurting your CIBIL score covers exactly how to time a closure to minimise this effect, including which card to close first if you're holding more than one.

Does a Short History Matter Less Over Time?

Yes, with diminishing returns. The jump from six months of credit history to two years typically moves this factor meaningfully; the difference between fifteen years and twenty years barely registers, since bureaus have already accumulated more than enough data to judge a long-established pattern. If you're new to credit and have no way to shortcut the calendar, the more effective lever is strong performance on the factors you can control immediately — on-time payments and low utilisation — while the history factor builds on its own. Our guide to building a CIBIL score from zero covers exactly this scenario for first-time credit users.

Practical Takeaways

• Keep your oldest credit card open if it carries no annual fee — even light, occasional use keeps the account active and preserves its contribution to your average age.
• Avoid applying for several new cards in a short span purely to chase sign-up rewards; each one pulls your average account age down and adds a fresh inquiry on top.
• If you're deciding how many credit cards you actually need, factor in that closing several accounts at once can dent this factor more than expected.
• Don't panic-close a rarely used old card the moment you get a shinier new one — a short waiting period and continued light use protects more of your score than an immediate closure.

The Bottom Line

Length of credit history is a factor you can't accelerate, but you also can't easily undo damage to it once you've closed old accounts. The simplest way to protect it is inaction: keep your oldest fee-free accounts open, use them occasionally, and resist the urge to churn through new cards faster than your credit file can absorb them. Everything else about your score is far more within your immediate control than this one is — which is exactly why it's worth not accidentally sabotaging it.