<prompt> Human: Me: 25, easily paying my cc bills in full with money to spare for savings. 750 credit score. I have 3 credit cards: 1 old credit card from 2010 with 1 cashback and revolving 5 a month categories that i use for most spending 2 BofA cashback card since 2013 with 3 on gas that I use mostly for gas 3 Amex Blue 3 months old with 3 on groceries that I use for groceries and any big purchases so I can get the benefits of Amex.I want to get the Costco citibank credit card and use it instead of the BofA card and perhaps my old citi card, however Im afraid of canceling my two oldest cards since it will lower my average age of accounts. If I were to pick one I would cancel the BofA card. What should I do? Cancel one? Cancel Both? Neither?  <response>: Do they charge annual fees? If not, just leave them. Youre absolutely right about the age of accounts. 