[ConjunctionJunction]

It's been 5 seasons, but not 5 years. It seems that only about 18-24 months have passed:

http://www.wetpaint.com/walking-dead/articles/2014-01-06-timeline-how-long-zombie-apocalypse

[Cats Pajamas]

I stand corrected. Two years and they are still stone’s throw from Atlanta. It is becoming more obvious to me the show started there and will end there. TV shows these days never go much longer than seven or eight seasons. Look at Mad Men, Breaking Bad, great shows but the writers just can’t do it much past that.