Originally Posted by goAsia

I believe redtop's point was that Amex continues to report newly opened accounts as having been opened since the time you got your first account with them. So if the OP's oldest Amex is 6 years old, Amex will report the newly opened Delta Platinum account as 6 years old. In that case the average age of his accounts would be unaffected since he would be trading out one 6 year old account for another 6 year old account.