My experience is that google likes both old links and new links. We've lost some of our old links, and it's hurt our SERPs, even though we've also been adding new links in there place.
I think that someone is going to have to do some in depth analysis on each search engine to determine what the age range should be before the links go from being treated like fine wine to being treated like stale bread. There has to be some sort of statistical equation to pim down the boundaries.
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Nearly a Posting Virtuoso
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since May 2009