No fee AAdvantage MileUp Mastercard has had my teen daughter as a Authorized User for years and she uses it all of the time. She also has 2 other non-Citi cards but they don’t get used much. Setting up any of them was easy as pie. May not be for everyone but for mine it’s a no brainer.

All of my cards are set up with Auto Pay for the full amount each month via a bank account.

I’ve wondered about two things:

1. Does this actually help her credit score for when older?
2. Is there any way to change the AA earning account to hers? Right now they all go into my account.