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The whole age thing comes in to play as Google like to see the stability of a website, therefore the age of a domain can be hugely important as long as it has been in continuous operation, not just the domain but a site on that domain too.
How important its effects are difficult to justify, as you could only see a significant effect where you are very close (in all other aspects) to another domain. If your domain has better anchor texts or load speeds then the impact of this would be less reaching.
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