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A few thoughts regarding your guidelines: It can take 60 days for the PA of a new page to be updated in OSE. If the page you are attempting to acquire a link from is new I would not be concerned about the page's PA at all. The Domain Age is not a factor I would consider at all when acquiring a link. Toolbar PR is only updated every 3-4 months so you wont know the true PA of a page, especially if it is a new page. I would recommend the following primary considerations when acquiring links: site DA, popularity of the page which offers the link (if it is a new page, what is the expected PA/PR of the page in 90 days), relevance of site and page and the location of the link (in content, footer, etc).