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.