People born before 1946 were called - The Greatest Generation.
People born between 1946 and 1964 are called - The Baby Boomers.
People born between 1965 and 1979 are called - Generation X.
And people born between 1980 and 2010 are called - Generation Y.

Why do we call the last group generation Y?

Y should I get a job?
Y should I leave home and find my own place?
Y should I get a car when I can borrow yours?
Y should I clean my room?
Y should I wash and iron my own clothes?
Y should I buy any food?
Y should I stay at home looking after my children when my parents can do that?

But perhaps a cartoonist explained it most eloquently below...