I take it your english is not too good but from what I think your asking. The older your domain is, the more importance google will place on it
I think he mean what is the minimum age requirement of a domain so as to get indexed by google !! Well in that case just a day old domain can be indexed in serp's !!
You can did it within one hour....Eventhrough you just submit your URL to google search, it will take less than 2 weeks to get indexed