Generation X is the generation that comes before Gen Y or the millennial generation. According to Investopedia, Gen X was born between the mid-1960s and the early-1980s, after baby boomers and before millennials. Beresford Research places the birth years of Gen X between 1965 and 1980. Pew Research Center also defines Gen X as anyone born between 1965 and 1980. Therefore, Gen X is the generation born between the mid-1960s and the early-1980s.