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In simple terms, “Domain Age” refers to the amount of time during which a domain name has existed. It is how old a domain name is.
So for example, if a domain name was registered in 2010, the domain age will be 10 years by 2020.
And what's a domain name? It is the URL of a website, just as sutools.net. That is, the address with which Internet users can access your website.