Generations: The Real Differences Between Gen Z, Millennials, Gen X, Boomers, and Silents―and What They Mean for America's Future

In the chapters on Millennials and Generation Z, the author employs a distinct argumentative structure that first tests a popular narrative against quantitative data and then examines why that narrative persists despite evidence that complicates it. The Millennial chapter opens by acknowledging the pervasive stereotype of the generation as economically “screwed,” a group that “killed” traditional industries while failing to achieve the financial stability of their parents. The text then tests this perception against evidence from large-scale economic surveys, such as the Current Population Survey. By presenting inflation-adjusted income and homeownership data showing Millennials are, on average, faring as well as or better than previous generations at the same age, Twenge distinguishes aggregate economic outcomes from Millennials’ perceptions of their financial position. She then accounts for this disparity through material pressures and psychological factors, including high student loan debt, childcare costs that have far outpaced inflation, and the “relative deprivation” fostered by social media, where curated online lives create a skewed perception of others’ success. By combining economic measures with an account of subjective financial well-being, Twenge shows how Millennials can have comparatively strong aggregate economic outcomes alongside genuine financial pressures and a perception that they are worse off than earlier generations.

The analysis pivots on the widespread adoption of the smartphone around 2012, which functions as an important dividing point between the Millennial experience and that of Gen Z. The text presents Technology as the Engine of Cultural Change, using the rapid spread of smartphones to explain changes in the structure of adolescent social life. Millennials came of age as the internet and digital communication were developing, widespread smartphone and social media use became part of everyday adolescence for Gen Z. Twenge uses this difference to explain changes in how Gen Z spent their time and interacted with others. The sharp, post-2012 decline in in-person socializing and sleep coincides with the rise in smartphone and social media use, forming part of Twenge’s argument that digital media is the most likely explanation for the increase in adolescent mental-health problems. Her placement of the COVID-19 interlude alongside these generational chapters further demonstrates how technology can shape responses to a major historical event. Digital technologies enabled work, education, and social interaction to continue remotely, and the pandemic accelerated the existing movement toward virtual interaction. The interlude therefore extends the technology theme by showing how an external event can intensify an ongoing technological and cultural shift.

Across these two generations, the author traces the continued development of individualism and its expression in different areas of social life. For Millennials, individualism manifests as high self-confidence, greater emphasis on personal choice in decisions surrounding marriage and religion, and an optimistic belief in their own potential. This is a continuation and intensification of a trend already evident among Boomers and Gen X. Among Gen Z, Twenge extends this argument into changing understandings of gender identity. The Generational Shift Toward Individualism is expressed through greater acceptance of gender fluidity and substantial increases in transgender and nonbinary identification among young adults. Twenge explicitly interprets these changes as an extension of earlier individualistic values emphasizing uniqueness, personal choice, and the freedom to “be who you are” (350). By connecting changing understandings of gender to a cultural trend established across earlier generations, she presents Gen Z’s attitudes as a further development of individualism within the book’s longer generational trajectory.

The author uses longitudinal data to illustrate the continued development of two core generational trends: a slowing life cycle and declining mental health. Data on the delayed adoption of adult behaviors—from driving and dating to marriage and parenthood—demonstrate that Gen Z extends The Adoption of the Slow-Life Strategy already evident among Millennials. Twenge interprets Gen Z’s later movement into adult activities as part of a broader extension of childhood and adolescence. She also connects this emphasis on protection to changing conceptions of safety, arguing that the increasing protection of children from physical harm eventually expanded to include concern for “emotional safety.” This connection allows her to place Gen Z’s greater support for restrictions on some forms of offensive speech within the same slow-life framework. Longitudinal mental-health data reveal differences in the timing of psychological distress across the two generations. Millennials are depicted as having a happy, optimistic adolescence followed by rising rates of depression and “deaths of despair” (330) in adulthood. Among Gen Z, increases in loneliness, depression, self-harm, and suicide emerge during adolescence, with several measures rising sharply after 2012. Twenge builds her argument for digital media as the most likely explanation by bringing this timing together with evidence on declining in-person interaction, disrupted sleep, and comparable mental-health trends across countries that experienced widespread smartphone and social media adoption. The convergence of these different forms of evidence strengthens the causal case she constructs for digital media within Technology as the Engine of Cultural Change.