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.
Millennials, also called Gen Y, are born between 1980 and 2000. Today, the oldest is 35 and the youngest is 15. At the height of their influence, there were 76 million boomers. In 2030, there will be 78 million millennials.