Living on the Edge: An American Generation’s Journey through the Twentieth Century (University of Chicago Press, 2021) tells the story of the rarely studied 1900 generation, from their social origins to their old age, as they coped with and adapted to the revolutionary changes of the last century. Using longitudinal data from the Berkeley Guidance Study, the authors followed 420 parents (210 couples) born between 1885 and 1908, all of whom had children born in Berkeley between 1928–29. The analyses, which often challenge conventional wisdom, reveal their status as a “hinge generation,” or bridge, between past and present in their educational, work, and family experiences. Following highlights from the authors, four scholars offer critical commentary on the book. Matt Nelson addresses challenges related to analyzing kinship networks and patterns of economic assistance across the Great Depression era, pointing to measurement limitations that obscure important forms of aid. Kelly Condit-Shrestha raises concerns related to race and ethnicity, especially the absence of Black, American Indian, Chinese, Japanese, and Hispanic persons in the original study, as well as to westward migration, American Empire, and white-settler colonialism. Silvia Pedraza addresses crucial social class differences (middle class versus working class) in the expectations and experiences of women, calling for greater clarity in the relationship between women’s roles and notions of “respectability.” Finally, Evan Roberts takes up some of the complex methodological issues involved in leveraging historical data to understand the life course and identifying the uniquely disruptive nature of social change across generations and countries.