There will be cards that you can buy from gamestop, walmart, etc..
I think it was 30 bucks for 2 months if you dont have a card. You can just use cash.
I know in California you cant get a credit card till youre 21 now. Im positive there are people on here under that age.
Down side is that card for 2 months does not come out till the 20th.
I have not got my early access yet so im now exactly sure if you need a credit card to sign up for the free 30 days.