"The Fourth Turning" by William Strauss and Neil Howe.

[Bernardo de La Paz]

6. It's a thought provoking hypothesis but not especially fact based

The Strauss and Howe interpretation of history through a generational lens has received mixed reviews and described as a form of pseudoscience.[3][6][7] Some reviewers have praised the authors for their ambition, erudition, and accessibility. For example, former U.S. Vice President Al Gore called Generations: The History of America's Future, 1584 to 2069 the most stimulating book on American history he'd ever read, and sent a copy to each member of Congress.[5] The theory has been influential in the fields of generational studies, marketing, and business management literature. However, it has also been criticized by historians, political scientists, and journalists, as being overly deterministic, non-falsifiable, and unsupported by rigorous evidence.[1][2][3]

https://en.wikipedia.org/wiki/Strauss%E2%80%93Howe_generational_theory