That Wikipedia page is the most hilarious wtf I have ever seen. I did not see this &quot;&lt; 25%&quot; number you mention, but I read that &quot;In 2011, a survey conducted by TIAA-CREF Institute senior researcher Paul J. Yakoboski estimated that 73% of professors with senior tenure ranged between the ages of 60 and 66 and that the remaining 27% were above the age of 66.&quot;<p>Then I read the reference and it said &quot;To this end, the TIAA-CREF Institute surveyed full-time college and university faculty age 60 and older regarding issues related to whether and when to retire.&quot; The survey is about seniors (in terms of age) because TIAA-CREF is a retirement account company, not &quot;senior tenure&quot; whatever that means. I&#x27;m actually more surprised that the number of professors over 60 is not 100% since that&#x27;s the only population surveyed.<p>The rest of the Wikipedia page is similarly biased, &quot;Today (2015), adjunct professors, hired for their low cost only, rather than expertise, make up more than half the teaching faculty at United States universities.&quot; I can&#x27;t tell if the Wikipedia article is intentionally ridiculous or if it&#x27;s some parody article.