Technically, it isn't the domain age that is important, it is the age of the URL in Google's index.

Age of a domain is important because it help you define how trust your domain is. The older your domain are, it able to gain more trust from Google .
It not only give you some privilege in SERP and Ranking. It help you not that easy to involve in Google Sandbox because your domain been in trust zone for some times. Google prefer old domain and sites having quality back links as well as good ranking .

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Domain age can be useful in terms of maintaining a website which can have potentials of enjoying top ranks over the net, but provided that the old domain has been connected with an active website online during months and years of registration, and not just using parked addresses which have been deserted with no tangible web space, simply considered to be registered addresses but with no presence because domains always need to be attached to active websites online.

A ten year old domain can be like an address registered just a few weeks ago if it has been simply registered but not taken care of. The older websites which truly are of great values have been functioning online for months and years, powered by links that have also been online for a long time, valuable contents that have been indexed by the top search engines and have already created some established presence in the cyber atmosphere and they would be extremely valuable indeed.

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Ya..Domain age is important factor in SEO. If you have a old domain, it will have high rank than new domain.
You can calculate this domain age using the WhoisXY.com .
It provides the domain creation date which helps to get the domain age..

Age of a domain is very important because of the backlinks and traffic accumulated by a site that may increase the chance of getting on top of SERPs.

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If you have old domain age then its easy to rank in the google. Google give extra important of domain age.

There is a certain amount of debate about exactly how important domain age is to your ability to rank well, but testing and experience by SEO professionals paints a pretty clear picture that an older domain age competes for rankings a bit better. In fact, Google has even stepped forward to tell us a little bit about the importance of domain age, though as usual they’re still holding their cards close to their chest.

Here’s the basics of what we know:

Domain age is a factor in determining Google rankings, and a part of our SEO.
Sites are significantly devalued for the first few months after Google first discovers them. It is extremely challenging to rank well for competitive terms in those first few months. In fact, some SEO professionals simply won’t work with brand new domains.
According to Google’s Matt Cutts, the difference between a domain that’s 6 months old and 12 months old is very small.

Domain age is an important SEO factor for your Google ranking. Among the hundreds of weighting factors that Google considers in determining how to rank search engine results is the age of your domain — in other words, how long that domain has been around.

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Domain age as in age the domain was registered is a very minor factor. Page age as in the date the page first appears in the Google index as a definite webpage seems to be of moderate significance. Link age is also very important.

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Domain age is really very important for your website ranking. It is also one of the factor of seo. If your domain age is longer, search engine will consider your website as a reputed website.

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