<prompt> Human: My wife and I are considering adding our young daughters as authorized signers on our credit card, not to use, but simply to help them build a good credit history. Personally, I think its dumb that being an authorized signer even affects your credit score, but that isnt up to me. Note that they would not be joint account holders or in any way legally responsible for any debt, of which we have none.Has anybody else done this, or had their parents do this for them? Was there any benefit or downside? How did it turn out?  <response>: Authorized user, not signer. And its a great way to help them build credit.Not all cards will report for AUs, and there are different rules about age. Its typically a minimum of 16, most often 18.Amex is 16 and will report if I recall correctly. 