Matt Cutts, according to a previous post on this board, apparently did a demo at a conference when he personally did a whois lookup to bust a link farm. They have the technology. I suspect, however, it's more likely used in human reviews and rare cases. Still, each year that passes, I am more reluctant to link to any of my other sites. Note that the Adsense code signal is a stronger signal of domain ownership and uses no additional resources. Google already got the code when it crawled your sites (for those who use Adsense).
Domain registration length as a signal of quality, legitimacy, or authority is a very weak signal. It's too easy and cheap to add years. Besides, Google staff have dismissed its value.
"To the best of my knowledge, no search engine has ever confirmed that they use length-of-registration as a factor in scoring. If a company is asserting that as a fact, that would be troubling."