"Gen X is the most Republican of the generations," said Jean Twenge, a psychology professor at San Diego State University and author of the book Generations, which examines what drives generational differences. NPR/PBS NewsHour/Marist polling underscores that point: By generation, Biden has the highest disapproval rating from Generation X (62%), compared with the Silent/Greatest Generation (48%), baby boomers (48%) and Generation Z/millennials (50%). Biden also has the highest "strongly disapprove" rating from Gen X (52%), compared with the Silent/Greatest Generation (41%), boomers (39%) and Gen Z/millennials (35%).