1946-1964 is the most precise Baby Boomers spans.so i vote 1946-1964.Because i agree and identify with that definition and the span the most.And keep in mind according to US Generation cohorts in 1985,
Baby Boomer cohort number one (born 1946–55), the cohort who epitomized the cultural change of the sixties
Memorable events: the Cold War (and associated Red Scare), the Cuban Missile Crisis, assassinations of JFK, Robert Kennedy, and Martin Luther King, Jr., political unrest, walk on the moon, risk of the draft into the Vietnam War or actual military service during the Vietnam War, anti-war protests, social experimentation, sexual freedom, drug experimentation, the Civil Rights Movement, environmental movement, women's movement, protests and riots, and Woodstock.
Key characteristics: experimental, individualism, free spirited, social cause oriented.
Baby Boomer cohort number two (born 1956–64)
Memorable events: the Cold War, the Cuban Missile Crisis and the assassinations of John F. Kennedy, Robert Kennedy, and Martin Luther King, Jr., for those born in the first couple of years of this generation, the Vietnam War, walk on the moon, Watergate and Nixon's resignation, lowered drinking age to 18 in many states 1970–1976 (followed by raising back to 21 in the mid-1980s as a result of congressional lobbying by Mothers Against Drunk Driving (MADD)), the oil embargo, raging inflation, gasoline shortages, economic recession and lack of viable career opportunities upon graduation from high school or college, Jimmy Carter's reimposition of registration for the draft, the Iran hostage crisis, Ronald Reagan, Live Aid
https://en.wikipedia.org/wiki/Baby_boomers