Was it your only collection account/charge off? There's a good chance you were rebucketed.
Collection accounts do not count toward your AAOA.
2009-10 - C/Os
2011 - Debts paid, no open credit
2012 - Rebuilding started, secured cards opened, SL rehabbed - EQ myFICO 636
2014 - 10k Discover, 3.5k Freedom, AmEx Green, SL, Auto Loan - EQ myFICO 695
