When applying for a credit card supplementary card, the applicant can be under the age of 18. The specific restrictions vary from bank to bank, usually ranging from 13 to 25 years old. For example, the age limit for ICBC and Bank of China credit card supplementary cards is 16 years old. However, if an individual needs to apply for a credit card, he must fully comply with the age range specified by the bank, that is, he must be over 18 years old. Advantages of credit card supplementary cards

1. For teenagers who do not meet the requirements for credit card application, credit card supplementary cards are a convenient tool to meet personal daily consumption. For example, college students have reached the age where they can control their own living expenses. But you can't apply for a credit card, so you can go to the bank with your parents to apply for a credit card supplementary card at this time. The function of the credit card supplementary card is basically the same as that of a credit card. It has the function of prepaying the amount in advance, and you can pay it off before the repayment deadline;

2. Generally speaking, both the main credit card and the supplementary card have annual fees, but the supplementary card has an annual fee. The annual fee is half cheaper than that of the main card, which is affordable and practical and will not bring any monetary burden to individuals who open supplementary cards;

3. If you use the supplementary credit card a certain number of times, And if your credit status is good, you can apply for a waiver of annual fees at some banks. It should be noted that the supplementary credit card is not the main card after all. The ownership of the supplementary card belongs to the main card. The parent who opens the main card can perform any operation on the supplementary card, such as freezing or canceling the account, etc.