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According to me, domain name age factor do count, but what most counts is the link age factor(that too from quality source)
Many .edu/.gov websites are ranking better in SERPs, its mostly due to the amount of links they have accumulated with time. People do say, more preference is given to these websites but its link age they have which gives them chance to rank better.
After all, its about collecting links from quality places. A link from a quality website will count more then 100s of unrelated low quality links.
Youtube, out ranked other website because of large amount of links which it accumulated during the time period.
Everyone, had almost each linking pointing to it. Which did made it authority and quality link in much less time.
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