Okay, so I've got an Amex card that I've had since 1999 in one form or another. It was probably a Green, then a Gold and at the moment its a Platinum. But since I've got my $400 in credits out of it, I'm either going to downgrade it back to Green before the membership fee hits in a month or so, or I'm going to cancel the card outright. Now, as I understand it, keeping some of your oldest cards open helps your credit score. So I've been keeping this Amex and an old Citi AA World M/C I've had for a while. But as I understand it now, Amex back-dates all your Amex cards (maybe only your personal ones?) to the date of your earliest card with them. Not the month, but the year. So for example my Amex SPG Personal Card shows a member since of '99. So I'm wondering if there's really any particular point in keeping this Amex open? I've got three other Amex cards at the moment--an MB Plat, a Gold Business Rewards, and an SPG. Seems like closing any of these is basically the same deal... Thoughts?