As per Matt Cutts statement, for new website, there is little weight given to domain age. For a new site, domain age is a factor, because typically a new site does not have much content on it, so for that reason it will be more difficult to rank well in the search index. After a few months, site rankings can be based on giving visitors the good content they are looking for, so at that point age is no longer such an important issue.
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References: http://www.smallbusinessbrief.com/forum/showthread.php?t=76661

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