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.
It’s worth noting that domain age isn’t referring just to how long you have owned a given domain name, but instead how long it has been since Google first indexed that domain, or saw a link to the domain. Because of this many companies purchase “aged” domains that have been around for a while for the extra bit of Google oomph.