Colby and Ortman 2014 — The Baby Boom Cohort in the United States 2012 to 2060

Summary

A 16-page U.S. Census Bureau Current Population Report (P25-1141) using the 2012 National Projections (cohort-component method, base 2010 Census) to document the size, growth, racial composition, and age-structural implications of the baby boom cohort (born mid-1946 to mid-1964) through 2060. The report is descriptive rather than analytical — its contribution is a consistent set of quantitative benchmarks for the boomer bulge's demographic footprint and its path through the age structure over the next half-century.

Key Claims

Baby boomers are defined as those born between mid-1946 and mid-1964 — 18 years of elevated fertility following WWII, with birth rates rising from under $24$ / $1{,}000$ population in 1946 to peak $26.5$ in 1947, sustained above pre-boom levels through 1964.
The boom was characterized by an unprecedented number of births (peaking at $4.3$ million in 1957), not an unprecedented rate ( $3{,}724$ per $1{,}000$ women in 1957 — the echo boom matched this in absolute births by 2007 with only $2{,}123$ per $1{,}000$ women).
Cohort size peaked at $78.8$ million in 1999 (including immigration); in 2012, $76.4$ million; projected $59.8$ million in 2030; $2.4$ million in 2060 (surviving boomers 96+ by then).
First boomers turned 65 in 2011; by 2029 all boomers are 65+; by 2056 population 65+ will surpass population under 18 for the first time in U.S. history.
Old-age dependency ratio (65+ per 100 working-age adults) rises from $\approx 21$ (2010) to $\approx 35$ (2030) — an increase of $14$ older residents per 100 workers within 20 years.
By 2030: $18\%$ of the U.S. population will be 65–84 and $2.5\%$ will be 85+; by 2050 those shares shift to $16\%$ and $\approx 5\%$ .
Race/ethnicity: $72\%$ of baby boomers were non-Hispanic White alone in 2012 vs. $63\%$ of total population. Non-Hispanic White share of total U.S. population is projected to fall from $63\%$ (2012) to $55\%$ (2030) to $43\%$ (2060), driven by immigration and minority births — not by boomer mortality alone, but the boomer cohort's predominantly White composition accelerates this trend as they age out.
Echo boom (births 1976–2001): birth cohorts were nearly as large as the original boom in absolute numbers, but at a total fertility rate (TFR) of $\approx 2.1$ vs. $\approx 3.7$ — same raw count, fundamentally different fertility regime, driven by many more women having fewer children.
Sex ratio: boomers were majority male through 2004; post-2005 female boomers outnumber males as higher male mortality takes its toll; this female excess widens with age.

Concepts Introduced or Extended

Entities Mentioned

Quotes

"By 2030, when all of the baby boomers will be 65 years and over, more than 20 percent of the total U.S. population will be over the age of 65."

"By 2056, the population 65 years and over is projected to become larger than the population under 18 years."

"Old-age dependency is projected to surpass youth dependency in 2056."

My Take

This is a descriptive statistical reference document, not a research paper. Its value is in providing a single consistent source for the quantitative benchmarks of the boomer bulge: cohort size trajectory ( $78.8$ M peak → $59.8$ M in 2030 → $2.4$ M in 2060), dependency ratio inflection points, and the 2056 crossing date when elder population exceeds child population. These numbers appear frequently in Disability Insurance (DI) growth decomposition and Social Security solvency discussions but are rarely sourced precisely. The 2012 National Projections underlying this report are cohort-component with Middle-series assumptions; they are now $\approx 12$ years old and would be updated by 2017 and 2023 Census projections, but the boomer bulge trajectory they describe is mechanically driven by existing cohort sizes (already born in 2014) and thus relatively insensitive to updated fertility or migration assumptions.