Postal credit cards can be applied for by those aged 18-60. The application conditions for Postal Savings Credit Card are: Applicants applying for the main card of Postal Savings Credit Card must be residents of mainland China who are over 18 years old and under 60 years old, so Postal Savings Credit Card can be applied for between 18 and 60 years old. Users can apply if they meet the age requirements and bring their resident ID card or household registration book.