<prompt> Human: Hi Reddit,Im a 27 year old engineer with excellent credit 815850 according to Credit Karma. I currently have 5 credit cards plus my car loan listed on my credit report. 2 of the cards are from my parents account that I havent had or used in years. I have 2 that I use regularly, and 1 that I have for real emergencies only. This one only has a 1000 credit limit. Anyway, Im planning on proposing to my girlfriend this year, and was going to open a new card with the longest possible 0 APR for this purpose. My 2 questions are, 1 is this a good idea? And 2 should I cancel my emergency card before opening this new one? Thanks in advance for any advice!  <response>: As long as it does not have an annual fee, leave it open. It will continue to contribute to your Average Age of Accounts, which is the hardest thing to build. It will also add that 1,000 to your total available credit, which is not a bad idea.The Chase Freedom, Freedom Unlimited, Citi Doublecash, and Citi Simplicity have 15-18 0 APR periods, no annual fee, and are cashback. Freedom Unlimited has 1.5, no limits, and Doublecash has 2 cashback - 1 on charge, 1 on payback.Freedom Unlimited have a 150 signup bonus with a minimum spend, which you will very likely meet. 