It’s a lot of text but I don’t have statistics to go on. I hope the images illustrate the points effectively.
Finlay, J. (2010, May 17). Andragogy (Adult Learning). Retrieved from https://www.youtube.com/watch?v=vLoPiHUZbEw
Pappas, C. (2013, May 9). The Adult Learning Theory – Andragogy – of Malcolm Knowles. Retrieved from https://elearningindustry.com/the-adult-learning-theory-andragogy-of-malcolm-knowles
Cites Knowles 1984 but there are two sources in the list from 1984, not sure which one.
Fink, D. (2010, November 1). American Academy of Neurology Recommendation. Retrieved from https://theconcussionblog.com/2010/11/01/american-academy-of-neurology-recommendation/
Several: (n.d.). Retrieved from http://clipart-library.com/balance-scale-clipart.html, all licensed under Creative Commons