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.
Just how many more is tough to know, but the behavior of the Gen X population provides some clues. Generation Xâs labor force participation rate peaked in 2008 at 84%. In 1998, Gen Xers were roughly the same ages (18 to 33) as todayâs Millennials, and that year, only 80% of the Gen X population was in the labor force.