In 2015, the number of Millennials is expected to surpass the Baby Boomer generation. According to the Pew Research Center, last month's population projection completed by the U.S. Census Bureau found that Baby Boomers are currently the largest living generation, at 74.9 million. However, Millenials— those between the ages of 18 and 34—will pass 75.3 million by year's end.
The number of Millennials is expected to peak in 2036, at 81.1 million. According to the Cenus Bureau, the Baby Boomer generation peaked in 1999 when there were 78.8 milliion individuals.
Generation X is comprised of individuals who are between the ages of 35 and 50. This generation is expected to grow for a few years before peaking at 65.8 million in 2018.