Hmm, I've always wondered this myself, now I know.

- People born before 1946 were called The Silent generation.

- The Baby Boomers, are people born between 1946 and 1959.

- Generation X, people have been born between 1960 and 1979.

- Generation Y, are the people born between 1980 and 2009. 

Why do we call the last group Generation Y? I never did know, but recently a cartoonist explained it very eloquently below.