Length of Credit History: Why It Matters and How to Protect It

What Is Length of Credit History?

Length of credit history is one of the five major factors that determine your FICO credit score. It accounts for approximately 15% of your total score. This factor measures how long you have been using credit, how long your oldest account has been open, how long your newest account has been open, and the average age of all your accounts combined.

The basic principle is simple: the longer your credit history, the more data lenders have to evaluate your behavior. A ten-year credit history filled with on-time payments provides far more confidence to a lender than a two-year history — even if both are spotless.

What Does the Scoring Model Actually Measure?

When scoring models assess the length of your credit history, they look at several specific metrics:

• Age of your oldest account: The account that has been open the longest anchors your credit history. Closing this account can significantly reduce the age of your history.
• Age of your newest account: When you open a new account, it lowers the average age of your accounts because you are adding a brand-new entry to the mix.
• Average age of all accounts: This is calculated by adding the ages of all your open accounts and dividing by the number of accounts. A higher average is better.
• How long specific accounts have been open: Individual account ages contribute to the overall picture.

Why Lenders Value a Long Credit History

A longer credit history gives lenders a more complete picture of how you handle debt over time. Anyone can make payments on time for a year or two. But someone with fifteen years of consistent, responsible credit behavior has demonstrated sustained financial discipline through different economic conditions, life changes, and financial challenges. That track record reduces lender risk.

This is why age of accounts matters even for people with excellent payment history. Two people might both have perfect payment records, but the one with a 15-year history will likely score higher than the one with a 2-year history.

How New Accounts Affect Your Credit History Age

Every time you open a new credit account, it reduces the average age of your accounts. This is one reason why opening too many new accounts in a short period can temporarily hurt your score in multiple ways — new accounts trigger hard inquiries, create a new credit account with zero history, and pull down your average account age all at once.

For example, if you have accounts that are 10, 8, and 5 years old, your average account age is about 7.7 years. If you open two new accounts, your average drops to about 4.6 years — a significant reduction.

Should You Keep Old Credit Cards Open?

One of the most common and costly credit mistakes is closing old credit card accounts. People often close old cards because they no longer use them or want to simplify their finances. However, closing an old account can harm your score in two ways:

1. It may reduce your oldest account age if you close the account that has been open the longest.
2. It reduces your total available credit, which increases your credit utilization ratio — another major scoring factor.

The better strategy is to keep old accounts open, even if you rarely use them. Consider putting a small recurring charge — such as a streaming subscription — on an old card and setting it to auto-pay each month. This keeps the account active without requiring much attention.

When Does Credit History Start?

Your credit history begins the moment a creditor reports your first account to the credit bureaus. This is typically when you open your first credit card, student loan, or other reported credit account. The account does not need to be active for the history to count — closed accounts remain on your credit report for up to ten years and continue to be factored into your history during that time.

Can You Speed Up the Aging Process?

Unfortunately, there is no shortcut to a long credit history. Time is the only factor. However, there are strategies that can help you get the most from whatever history you do have:

• Become an authorized user on an older family member's credit card. If the account has a long, positive history, it can be added to your credit report and boost your average account age.
• Open accounts early and keep them open. The sooner you start, the faster your history grows.
• Avoid unnecessary new accounts that would dilute your average account age without adding significant benefits.

Length of Credit History vs Other Factors

While length of credit history (15%) is important, it is outweighed by payment history (35%) and credit utilization (30%). If you have a short credit history, focus on building a perfect payment record and keeping utilization low. A 2-year history with no late payments and 10% utilization will outperform a 10-year history riddled with late payments. Build good habits now and let time do the rest of the work.