What is an antigen? Antigen refers to any foreign substance which on entering the body  stimulates the production of antibodies in the body of the  individual as a part of the immune response.
Gen Z Defined. Gen Z consumers range from ages 2 to 19, though the target range for marketers lies from ages 11 to 16. Gen Z is the most diverse and multicultural of any generation in the U.S. -- 55% are Caucasian, 24% are Hispanic, 14% are African-American and 4% are Asian. Gen Z Beliefs.
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).