In my "Jigsaw Gens" series, I look at the generational spectrum as being continuous and fluid:

https://eichy815.medium.com/jigsaw-gens-the-complete-series-956f99da6a3c

Pretty much what you're saying. Intergenerational conflict is cyclical. The battle between old vs. young vs. middle age is timeless. There's no hard science as to where one generation "ends" and the next one "begins."