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

While many theories explain generational divides by pointing to major historical events like wars or recessions, Twenge’s Generations puts forward a different and more fundamental catalyst: linear technological advancement. Twenge builds her central argument around what she calls the “Technology Model of Generations” (5), a framework positing that innovations in medicine, communication, and daily life are the primary drivers of cultural and psychological change. By contrasting the technologically saturated, rapidly evolving modern world with what she characterizes as the relative cultural stability of an isolated society like North Sentinel Island, Twenge argues that technology is the ultimate root cause of the distinct values, behaviors, and lifestyles that define each generation. Her model therefore presents generational shifts as consequences of technological change, while allowing major events and other factors to play secondary roles.

At the core of this model is the idea that technology is the “mother turtle” upon which other causes of generational change rest. Twenge argues that theories focused primarily on major events miss the deeper, linear progressions that define modern life. For example, she notes how innovations like household appliances, air-conditioning, and birth control have “downstream consequences” that extend far beyond their immediate functions. Home appliances like washing machines and microwaves increased leisure time, helped enable women to pursue careers, and made it easier for people to live alone. Similarly, the birth control pill, introduced in 1960, led to more premarital sex and a lower birth rate, while also enabling more women to pursue careers. Twenge argues that even major events are often shaped by technology: The 9/11 attacks used airplanes as weapons, and the COVID-19 pandemic spread globally via air travel.

Twenge argues that technological change has disrupted the historical cycles of generational archetypes proposed by theorists like William Strauss and Neil Howe. Their model predicted that Millennials would resemble the civic-minded “Greatest Generation,” coming together to face crises with a sense of duty. Instead, during the COVID-19 pandemic, Twenge argues that Millennials did not respond collectively as predicted: Patriotism declined, and rule-following became controversial, a pattern she attributes primarily to individualism. She similarly notes that Gen Z has not resembled the Silent Generation as Strauss and Howe predicted, particularly in attitudes toward gender roles and marriage. The introduction of the iPhone in 2007 is a prime example of a sharp technological break. For Gen Z, who came of age as smartphones and social media rapidly became widespread, these technologies changed how young people communicated and socialized. Twenge argues that this shift contributed to the post-2012 rise in teen depression, self-harm, and suicide.

By identifying technology as the primary engine of change, Twenge presents a theory that connects a range of generational trends across the last century. From changes in domestic life and women’s employment to the advent of remote work, technology shapes the parameters of daily life, and each generation adapts to the world technology creates. In this view, understanding generational differences requires considering the long-term effects of technological change while recognizing the secondary role Twenge assigns to major historical events and examining how new technologies affect how we live, think, and relate to one another.