17 years old can only apply for parents' supplementary cards, and you must be at least 18 years old to apply for the main card.

First, the credit card supplementary card conditions:

1. The supplementary card applicant must be the immediate family members of the main card applicant, such as spouse, parents, brothers and sisters, etc.

2. Credit card holders can apply for supplementary cards for other natural persons with full capacity for civil conduct or natural persons with limited capacity for civil conduct (with the permission of their legal representatives), and the main card holders can apply for cancellation of supplementary cards at any time.

2. As the principal card applicant, you need to provide the following information:

1. identification documents: if the applicant for the main card and the auxiliary card is a domestic resident, a copy of the resident ID card or military officer's card, an application form for the main card of 18-60 years old and an application form for the auxiliary card of 16-65 years old must be provided;

2. Salary certificate of the work unit: salary table or income certificate (with the financial seal or official seal of the unit), work permit or work permit with my photo, business card, etc. A certificate that can be issued for the applicant's work unit.

3. Financial proof: it is helpful to obtain a higher credit line, such as a copy of the certificate of own property or the original and copy of the motor vehicle driving license.

Third, how to handle the credit card?

You can download the application form online or pick it up at the outlet, and then fill in the fields of the primary card number and the secondary card. The cardholder of the primary card and the cardholder of the secondary card shall sign their names in the signature columns of the primary card and the secondary card respectively. Attach a copy of the cardholder's ID card, and then submit the application form and related materials at the bank outlet.

At present, online credit card application does not support supplementary card application for the time being. Therefore, you can directly submit the application form and related materials to the bank outlets.