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This is the tool that will let you check the age of any website. You can enter the domain, which will tell you how old it is, including the date of its creation and expiry. If a site is young, chances are it offers little value. If a site is old, then it may have been around for quite some time, so this may be a good indication that it's a valuable website or domain. You can also check the number of backlinks to the domain, which is also an indication of a powerful domain in terms of SEO. The higher the number of backlinks is, the more valuable it is. You can also get an estimation of a domain's value with this tool.