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-15% affects Established History. The longer you maintain open accounts with creditors the better. When first starting out of course this is not easy; but this is where getting added as an Authorized User to another persons established credit comes in best. Remember that the contributor must have an account that has long history; clean payment record; high credit limit; and low balance. Also need to check with the creditor to insure that they have a policy to report authorized user accounts to all three major credit reporting agencies.
http://ficoforums.myfico.com/fico/board/message?board.id=ficoscoring&thread.id=2654
When FICO 08 is available and creditors begin using it, AU accounts will not affect score.
How old is your oldest account now?
Do you have revolving credit on your report now?
If so, what is your util?