There is definitely more in your birth cohort than in the positions of the constellations. People often point at X being the generation with a free outdoor youth, but computers and mobile phones in their late teens and/or adulthood. Millennials never had a time without internet, were often baby sat by iPads.

The earlier generations were defined by wars and the great depression, perhaps future generations will only be useful to demographers

Maybe there's no real meaning in generations beyond Millennials (the last group with a different digital life to the prior generation), at least until some major crisis or advance makes us point out the groups affected