The Baby Boomers are a demographic cohort following the Silent Generation and preceding Generation X. They are often defined as people born from 1946 to 1964 during the mid-20th century baby boom. The dates, demographic context, and cultural identifiers may vary by country. The baby boom has been described variously as a "shockwave" and as "the pig in the python". Most baby boomers are children of either the Greatest Generation or the Silent Generation, and are often parents of Gen Xers and Millennials, or Generation Z. The generation can be segmented into two broadly defined cohorts in the US: the "leading-edge baby boomers" are individuals born between 1946 and 1955, those who came of age during the Vietnam War and Civil Rights eras. This group represents slightly more than half of the generation, or roughly 38,002,000 people. Trailing-edge boomers (also known as Generation Jones) came of age in the "malaise era" of the 1970s with events such as the Watergate scandal, the 1973–1975 recession. According to the US Census Bureau, there were 76.4 million baby boomers born from 1946 to 1964, and nearly 11 million had died by 2012, leaving some 65.2 million survivors.