I think every new domain will require an approval. 6 months is related to the newly registered domains. If you change adsense to another domain that has been registered for more than 6 months ago then it should work.
I don't believe so. Services like DomainTools show all the previous registrations and keep history. Adsense is a very serious business for Google and I'm 100% sure they thought of every possible trick people might do.
Today I was surfing net and I found a site with google adsense enabled, from india, domain age less than 6 moths. How they approved them but not me ? nothingwired.com Whois : http://whois.net/whois/nothingwired.com
Get your domain aged. Google has implemented this policy to curb spammy websites. Unfortunately, this policy is applicable for most of the South Asian websites. You need to wait for 6 months in order to get your website approved for adsense. Don't take these 6 months as a waiting period but take it as an opportunity to make your website perfect in the eyes of big G. If you can do so then there is no stopping you. Even I am going through the same thing. I created my domain 8 months back and I am still working on it to make it perfect. Adsense is a serious business for Google as there are loads of advertisers paying to the company in through adwords.
Mayank I would like to thank you for putting this question in this forum. The email account I use for webmaster tool and analytics is locked with a blog and I had no clue what to do. Now I know what needs to be done and hope so this time I will get my domain approved.