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celenoid - 10:52 pm on Oct 7, 2004 (gmt 0)
Of about 20 pages it is very clear that the oldest links (>2 months) were awarded PR3. Middle aged (>1 month) received PR2, and new links (a few weeks), PR1. I'm certain that these pages are linked by no other means.
I tend to agree there is an age factor involved. On a relatively new site, all pages linked from the homepage gained PR for the first time and range from PR1 - PR3.