Baby Boomers: Baby boomers were born between 1944 and 1964. They're current between 56-76 years old (76 million in U.S.) Gen X: Gen X was born between 1965 - 1980 and are currently between 41-55 years old (82 million people in U.S.) Gen Y: Gen Y, or Millennials, were born between 1981 and 1996.