6 months validity is not for crappy or empty site. Its only for those sites which have good amount of quality content and some good amount of traffic through social media or search engines.
maybe it should be. I know on some networks, if you do not have anything to bring to the table other then a dead/empty site, then you are out of luck...
I got my account piggybacking on a user generated content site that allowed AdSense sharing. You may want to look into that and then add your own website later.
Adsesnse says 6 months but you can get accepted fast if you have a nice website and great content .They must see you as a great bloger and they will accept you even if you have a month