So I'm buying a lot of aged/PR domains these days. A lot of my sites tanked over Penguin so I plan on making a private blog network. One of the sites that decreased in rank is one that was #3. Currently it is not ranking (couple of days ago was on page 2/3). The keyword is low/low-medium competition. Because I was bored I wrote up an article of about 1000 words and posted it one of my aged domains yesterday (no PR). Its the only article on this domain. Let's say the keyword is "blue widgets", the KW is not part of the title tag, meta description etc. It is only in the article itself. I link out to my tanked site twice with anchor text: "blue widgets". Today I search for "blue widgets" and guess what? This aged domain that is totally NOT OPTIMIZED for this keyword is ranked...#8. Not sure how this happened... sure I knew age played a factor but this big of a factor? Yeah this aged domain has backlinks to it but I'm not sure if they play a huge role either. (Haven't built significant backlinks after purchasing the domain) Thoughts?