One social factor that could explain why the Baby Boomer generation is so much larger than the Gen X, Gen Y, or Gen Z cohorts is the post-World War II economic boom in the United States. The increase in economic prosperity during this time period led to higher birth rates, resulting in a larger Baby Boomer generation.
Gen Y and Gen Z are expected to affect the age structure and growth rate of the United States as they reach adulthood and begin to have families of their own. As Gen X reaches retirement age (65+), there may be a smaller working-age population to support them, potentially leading to changes in social welfare programs and healthcare systems to accommodate the aging population. Additionally, the diverse characteristics and preferences of Gen Y and Gen Z may impact consumer behavior, workforce dynamics, and cultural norms in the United States.