I recently bought a domain from a marketplace so am really unsure about the real age of this domain, but when I check it's age through several domain age tools I get mixed results: tool A says it's 5 years old whereas tool B says it's 3 months old? which tool is the most accurate?
If there was a site on that domain name you can also get some idea through archive.org, also check with this tools; http://www.seochat.com/seo-tools/domain-age/
http://www.webconfs.com/domain-age.php says my domain is 5 years and 3 months old but my whois says 3 months old i guess webconfs.com is wrong...
webconfs.com uses the waybackmachine to determine how old your domain is. The Whois is set to zero when the domain is dropped.