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C-Ya!
While closing a revolving account will not per se remove it from your AAoA (and possibly also your oldest accoount) calculation per se, the big unknown is what the creditor may then choose to do.
After an account in good standing has been closed, creditors have the incentive to report total deletion of the account to the CRA.
That removes any issues of continuing to monitor prior reporting for any possible changes that might require update, or for having to invest the time, effort and cost of responding to any possbile consumer disputes or requests for good will considerations.
Simply deleting the account removes those housekeeping issues.
If the creditor does delete, then any the account will of course be totally removed from any scoring issues, positive or negative, including age of accounts scoring.