 The "Oxford English Dictionary" dates the modern meaning of the term to a January 23, 1970, article in "The Washington Post".The Merriam-Webster Online Dictionary defines "baby boomer" as "a person born during a period of time in which there is a marked rise in a population's birthrate", "usually considered to be in the years from 1946 to 1964".Pew Research Center defines baby boomers as being born between 1946 and 1964.