Got a comment today on how to get Domain Age using Archive.org and, as the comment was too flattering to resist ... here it is. It uses the XPath query and it could have been done with RegExp only too. But ... it's a case study.

I think you are aware that this estimates the age. It's not exact as not all sites get scraped / accept scraping from the archive.org robot. More accurate results can be achieved using Whois Domain Age.
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