Definition of baby boomer
: a person born during a period of time in which there is a marked rise in a population's birth rate : a person born during a baby boom
especially
: a person born in the U.S. following the end of World War II (usually considered to be in the years from 1946 to 1964)
The viewer is older, an aging baby boomer whose '60s activism has been lost among the years. — Gary D. Christenson Industry experts predict that reverse mortgages will play an increasingly important role in the coming years as some 70 million baby boomers hit their 60s—often with a lot less saved than they'd hoped. — Cybele Weisser
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Merriam-Webster unabridged
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The first known use of baby boomer was in 1963
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