As a software programmer, I very, VERY strongly doubt Google checks the whois of matching websites' domains in determining how to rank results. If Google DOES rank older domains higher in practice, it's only a side-effect of older domains tending to have more backlinks and usage history than newly registered ones.
I've never really understood this apparent love affair between domainers and those "Record created on ..." lines in whois entries. To date, I have found a much stronger correlation between value/resaleability and INITIAL date the domain was registered than value/resaleability and PREVIOUS date the domain was registered, and this makes sense. The more popular and well-entrenched a concept in popular psyche, the earlier it will probably have been initially registered in the form of a domain name (exceptions include time-specific fads like "JoeThePlummer" and recent tech fads like "Blogs").
THINK for a second: If you're selling to an end-user, wouldn't he/she would probably be more interested in purchasing a domain with, say, tons of usage history since 1999 but dropped in '08 -- as the name probably gets substantial traffic -- than a domain that's been continuously registered since 1996 but has hardly been used at all?
Yes, I would still modify the auction title to read "has history since date XX", because domainers like to define "age" as it's written in that lofty "Record created on..." In my opinion, however, "has history since date XX" presents a much more compelling argument for purchasing a given domain than "aged since XX".