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Generation Names and Birth Years: A Clear U.S. Guide

Generation labels look wonderfully tidy until you compare two sources and discover the cutoff years do not always agree.

This guide uses current U.S. Census cohort definitions where available and flags the fuzzy edges, so you can tell the difference between a useful demographic label and a universal rule.

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Generation names and birth years at a glance

  • Silent Generation: born 1928 to 1945 in the U.S. Census birth-cohort framework.
  • Baby Boomers: born 1946 to 1964.
  • Generation X: born 1965 to 1980.
  • Millennials: born 1981 to 1996.
  • Generation Z: born 1997 to 2012.
  • Generation Alpha: born in or after 2013 in the 2025 Census mobility report.

These are useful U.S. demographic cohorts, not personality tests. Other researchers, marketers, historians, and countries may use different boundaries.

age group names

Silent Generation: 1928 to 1945

The U.S. Census Bureau’s recent birth-cohort work defines the Silent Generation as people born from 1928 through 1945.

The label is historical and cultural rather than a biological category, so it is best used when the source and country context are clear.

Baby Boomers: 1946 to 1964

This is the least ambiguous major U.S. generation boundary because it maps to the post-World War II baby boom. The Census Bureau and Pew Research Center both use 1946 through 1964.

Pew reported in January 2026 that the oldest Baby Boomers turn 80 during 2026, which is a useful reminder that generation labels move through age ranges as time passes.

age group names

Generation X: 1965 to 1980

The Census Bureau’s 2025 birth-cohort report uses 1965 through 1980 for Generation X.

This range also matches the boundary Pew has commonly used in its demographic work.

Millennials: 1981 to 1996

The Census Bureau’s current cohort framework uses 1981 through 1996 for Millennials.

Older sources sometimes describe Millennials more loosely, so include the birth years whenever precision matters.

Generation Z: 1997 to 2012

The U.S. Census Bureau’s 2025 cohort report uses 1997 through 2012 for Generation Z.

That does not mean every research organization or international source will use the exact same cutoff years.

age group names

Generation Alpha: 2013 and later in the Census framework

The Census Bureau’s 2025 mobility report labels people born in or after 2013 as Generation Alpha.

Unlike the Baby Boom, however, the endpoint of Generation Alpha is not tied to one universally recognized demographic event, so published definitions can vary.

What about the Greatest Generation?

Pew has historically used Greatest Generation for people born in 1927 or earlier in some demographic tables. Researchers may subdivide older cohorts differently depending on the historical question being studied.

Why generation date ranges disagree

Generations are cultural and analytical groupings, not official age classes written into law. Different organizations may choose boundaries based on historical events, survey design, marketing conventions, or the need to keep cohorts consistent across datasets.

Pew itself describes generations as somewhat imprecise cultural groupings and emphasizes the importance of defining cohorts clearly when making comparisons.

Sources I would trust for generation ranges

The practical takeaway

If you are writing a report, survey, or article, include the birth-year range instead of assuming the generation label is self-explanatory. “Gen Z, defined here as 1997 to 2012” is much clearer than pretending every source uses exactly the same boundary.