I was watching a video about "The Curse of the Eighth Decade", which supposedly prevents Israel from ever lasting more than 80 years. It was motivated by a generational dynamic: the founders care deeply about their project, their kids care about maintaining it, but their grandkids are kind of over it.
It reminded me of Strauss-Howe Generational Theory that seems to be growing in popularity: Hard times create strong men, strong men create good times, good times create weak men, weak men create hard times.
I'm fairly skeptical of these types of theories (if they even rise to the level of theories), but I do find them interesting to think and talk about.
Are there any generational theories you find particularly insightful or useful?