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.
Fabulousness awaits! Jay Z's got 99 problems -- and his age could be one! Controversial radio host Troi Torain [pictured below] claims the 44-year-old rapper (born Dec. 4, 1969) is actually 50 and he knows this because they're age mates..