<prompt> Human: In about 2 weeks I will be 18. I would like to start building credit as soon as possible, so I am going to go to the bank I have used for my checking account and apply for their student card after my birthday. I have heard that average account length is factored into your score, so could going to another bank and getting a similar card in addition to the first benefit me at all? My idea would be to throw a few expenses gas, Netflix, etc on each one every month and use them for nothing else.  <response>: No reason to have more than 1 at this age. 