the generation of persons born in the 1960s and 1970s, the children of the baby boomers, often variously regarded as apathetic, materialistic, irresponsible, etc.
See Generation X in American Heritage Dictionary 4
noun
The generation following the post-World War II baby boom, especially people born in the United States and Canada from the early 1960s to the late 1970s.
Origin:
Origin: After Generation X, a novel by Douglas Coupland (born 1961), Canadian writer