Google now being a domain registar and understanding the possibilty that sites are ranked by age. I would assume that they use the "Record created" date within the whois information.

So with that said, what would their algo think about a domain that has expired and aquired a fresh "Record created" date. Is their any possible way to know when a domain was in fact first made a domain or will google work with the current data.

in example: I grabbed a domain that had expired. it was dated 1998 in whois. Now dated 2004 in whois.
Excuse my ignorance if this is more simple than what I seem to understand at the moment.