Generation X is a term used to describe generations in many countries around the world. The exact demographic boundaries of Generation X are not well defined, depending on who is using the term, where and when. Typically, people born between 1963 and 1978 are generally considered "Generation X," while others use the term to describe anyone who was in their 20s some time during the 1990s. According to Neil Howe and William Strauss, Generation X includes anyone born from 1961 to 1981 in the United States. The term is used in demography, the social sciences, and marketing, though it is most often used in popular culture. The generation's influence over pop culture began in the 1980s and may have peaked in the 1990s. ***************************** One of the defining factors of Generation X is the transitions resulting from the decline of colonial imperialism to the fall of the Berlin Wall and the end of the Cold War. *****************The term was first used in a 1964 study of British youth by Jane Deverson. Deverson was asked by the editor of the magazine Woman's Own to conduct a series of interviews with teenagers of the time. The study revealed a generation of teenagers who "sleep together before they are married, don't believe in God, dislike the Queen, and don't respect parents," which was deemed unsuitable for the magazine because it was a new phenomenon. Deverson, in an attempt to save her research, worked with Hollywood correspondent Charles Hamblett to create a book about the study. Hamblett decided to name it Generation X.*****************In 1976, the phrase was picked up as the name of a punk rock band featuring Billy Idol, which released three albums before disbanding in 1981.However, the term Generation X was used to describe the early British punks more generally with their nihilism, rejection of earlier generation's values, and the feeling that they were a lost generation that meant nothing to society, and vice versa.****************The term, Generation X, was later popularized by Canadian novelist Douglas Coupland in Generation X: Tales for an Accelerated Culture, which describes the angst of those born between roughly 1960 and 1965, who felt no connection to the cultural icons of the baby boom generation. In Coupland's usage, the X referred to the namelessness of a generation that was coming into an awareness of its existence as a separate group but feeling overshadowed by the Boomer generation of which it was ostensibly a part.**************Coupland took the X from Paul Fussell's 1983 book Class, where the term "Category X" designated a region of America's social hierarchy, rather than a generation.