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I have listed some tools and helpful forums for this in the sheet specially for domain age and seo.

To check the domain age of a website, you can use online domain age checker tools. These tools typically require you to enter the website's domain name, and they will display the age of the domain along with other details like the domain creation date, expiration date, and sometimes the last updated date. Popular domain age checker tools include WHOIS Lookup, SmallSEOTools, and Domain Age Checker by SEOChat. Just visit one of these sites, enter the domain you're interested in, and you'll get the information you need.