Page Ranks are a quite debatable topic and a maximum number of people are not aware as to how a page in ranked. Certain factors like age of the page, backlinks, and the SEO content is used to prepare it methodically.
Earlier page ranks proved quite helpful and Google used it to determine the search rankings of the web pages. But today page ranks are not as important as they were and are one among the 200 tools that Google utilizes to determine the popularity of a web page. Page ranks play a vital role today as well but are not the only option or the leading force.