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.
1 Generation X (born 1961-1981), 88.5 million. 2  Generation Y (born 1982-2001) 18+, 52.0 million. 3  Two-thirds of the remaining 75 million are Gen Y who are under 18.  The remaining one-third (25 to 30 million) is Generation Z.