I have read that whenever you get a new Amex card it dates back to your oldest Amex card's opening date when calculating AAoA.
My brother has had his Amex card for almost 20 years. If I am added as an AU to his account it should help my AAoA.
What will happen if I then open my own (Would be my first ever Amex card)... Would it backdate to my brother's card or does the backdating only apply to the principal card member?
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Amex doesn't back date anymore. If it were Cap One, BofA, Chase or a Synchrony card. You'd get his 20 years of credit history.
