When two events (call them A and B) are Mutually Exclusive it is impossible for them to happen together: P(A and B) = 0. The probability of A and B together equals 0 (impossible).
Answer Wiki. Strauss & Howe, the social historians known for pioneering generational theory[1], would say that Gen X (the 13th generation) and Gen Y (the millennial generation) each have the traits of their corresponding generational archetypes. Generation X is generally used to refer to people born in the 60s and 70s. According to Strauss & Howe, it is a Nomad generation, an archetype they share with the Lost Generation of the 1890s and 1900s. Both generations are characterized by a disaffected attitude and general disdain for everything that came before.
Baby Boomers: 1946~1953 to 1964. This would make baby boomers, in the year 2010, somewhere in the ballpark of 46-64 years old. Gen X: 1965 to 1976~1982. This would make generation X, in the year 2010, somewhere in the ballpark of 28-45 years old. Gen Y: 1977~1982 to 1995~2001. This would make generation Y, in the year 2010, somewhere in the ballpark of 9-33 years old. For the most part, Generation Y are the children of the Baby Boomers, and in some cases, grandchildren. This is due to them being around their prime reproductive years during the 1980s (the last baby boomers turned 18 in 1982).