Ok I'm confused about a being an Authorized User on a Credit Card

[ilzhoefer]

I have heard different stories about being an authorized user on a credit card.

I have heard that it can help you and I have heard that it has no affect on the AU credit report.

My father added me as an authorized user to his long standing credit card. I am not going to use it, I just want to piggy back on his card to help boost my FICO score.

He's had it a long time and pays it off monthly.

Can someone help me understand?

[Henchman21]

You'll get his history and credit utilization. But some lenders will choose not to count that into your scores if they do a manual review of your report. It would better for you to also have your own revolving account.

[ilzhoefer]

I have a few revolving accounts.

I am hoping that his length 10+ years would help. It's with USAA and they told my father that it would not help me. I disagree, but maybe I'm wrong. This is why I ask for the experts to set me straight. 

[Henchman21]

It should help your AAoA and utilization(if his is low). I'm not sure if there's any other benefits.