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Your closed card will hopefully stay on your report for 10 years. At that point, any change in AAoA (average age of accounts) due to it dropping should be irrelevant. Do the combination.
The closed account will stay on your report for 10 years. It doesn't drop off in the conversion/consolidation.
The only bad thing that happens is a devil loses its pitchfork, I mean CapOne loses its power over you on the lesser card.
Yeah you should never close cards if you can avoid it, but it does feel so nice to rid yourself of this burden. You might be able to get them to remove the AF, they will call it an upgrade to the QS card, but it really is just a removal of the AF. If you can accomplish this then I would say don't close it, just put it in your sock drawer. If you can't just close through combining the limits and remember they weren't as helpful as they could have been and move on to other banks.