Millennials and Boomers are the lead characters in the looming generational showdown by dint of their vast numbers and strategic location in the life cycle. But what gives the drama an almost Shakespearean richness is something more: they’re also each other’s children and parents, bound together in an intricate web of love, support, anxiety, resentment, and interdependence. Every family, on some level, is a barter between the generations—I care for you when you’re young so you’ll care for me when I’m old. Every society needs to strike a similar intergenerational compact, then renegotiate the terms if the underlying demographics shift.