The notion that age and political ideology are related goes back at least to French monarchist statesman François Guizot, who originated the oft-mangled quotation, “Not to be a republican at 20 is proof of want of heart; to be one at 30 is proof of want of head.” But data from the Pew Research Center’s new political typology report indicate that, while different age cohorts do have markedly different profiles, the relationship is considerably more complex than young=liberal and old=conservative.