The leaders of many European countries are childless. Not since Oxford and Cambridge required celibacy of their dons has the university culture of the West been so dominated by childless professors. The same is true for the professions. In 1965, the ideal IBM employee was a married man with children. He was thought to be reliable and hungry for advancement. Today, the ideal Google employee is a single person without children, someone who is “flexible” and “creative.” The growing percentage of childless adults, especially at the higher reaches of society, is sure to have profound cultural and political consequences.