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Does it decrease AAoA immediately? If the total utilization hold below 10%. Does this affect my score? Which direction?
It does nothing to your AAoA... It still counts, even though you closed it
As mentioned proviously it does not affect your AAoA. Regarding the utilization take a look at this thread: http://ficoforums.myfico.com/t5/Credit-Cards/Closing-Credit-Cards/m-p/347190