What is meant by the age of a credit card?

It depends on the credit card companies policy. Yes, credit card helps to build credit score. However, you should use your credit cards properly. Pay the bill in full and with in time. Also stay within your credit limit so build a good credit score.

The age of credit basically denotes how long the accounts have been open. The age of credit is determined by the number of months and years your accounts have been open. The average age of accounts is called credit age. Suppose, you have 2 accounts. The first one is 3 years old and the second one is 5 years old, then your average credit age is 4 years.

Age of credit constitutes 15% of your credit score.

The age of credit is normally stated as how long the accounts have been open. If you have multiple credit card accounts, then the average age of all credit cards combined wil be your your average credit age.