Boomer Generation Shrinks by More than 1 Million

Between 2020 and 2021, the Baby Boom generation lost more than 1 million members, according to the Census Bureau's 2021 population estimates. Born from 1946 through 1964, Boomers numbered 71.4 million on July 1, 2020 and just 70.2 million on July 1, 2021—a loss of 1.1 million. Of course the Baby-Boom generation has been shrinking for years as it ages. The coronavirus pandemic pushed the Boomer losses above 1 million.

Boomers aren't alone in their decline. The number of Gen Xers fell by 245,000 between 2020 and 2021. Even the Millennial generation experienced its first-ever decline, falling by 80,000. The number of older Americans, born before 1945, experienced the biggest loss—a decline of 1.8 million. 

Size of generations in 2021 (and % of total population)
331,894,000 (100%): Total population
  47,412,000 (14%): Younger Americans (aged 0 to 11)
  64,940,000 (20%): Generation Z (aged 12 to 26)
  80,202,000 (24%): Millennial generation (aged 27 to 44)  
  49,088,000 (15%): Generation X (aged 45 to 56)  
  70,227,000 (21%): Baby Boom generation (aged 57 to 75)  
  20,024,000 (  6%): Older Americans (aged 76-plus)  

Note: Younger Americans were born in 2010 or later; Generation Z was born from 1995 through 2009; the Millennial generation was born from 1977 through 1994; Generation X was born from 1965 through 1976; the Baby-Boom generation was born from 1946 through 1964; Older Americans were born in 1945 or earlier.

Source: Census Bureau, National Population by Characteristics: 2020–2021