I recall having breakfast at a hotel in Brussels in 2017 and sitting across from Douglas Coupland, the author of Generation X: Tales for an Accelerated Culture, the 1991 book that gave my generation a sort of name that was really only a placeholder for a name. I wanted to tell him how much I resented him for this, but I couldn’t muster the courage to be disagreeable.

At the time it was my firm belief that generations did not exist, that they were simply a retroactive periodization that imposed narrative cohesion on history, one which…