The Walking Dead is an American horror and TV drama series, developed by Frank Darabont, based on the series of comics with the same title prepared by Robert Kirkman, Tony Moore, and Charlie Adlard. British actor Andrew Lincoln played the hero of the series as the Sheriff's Vice Rick Grimes, who wakes up from a coma to see the world as devastating around him, and the walking dead roaming the streets.

Rick meets his family who fled the city with a group of survivors and Rick becomes the group's leader. The group fights for survival and adaptation in the horrific world whose streets are filled with walking dead.
Here are the wallking dead cast Real Age
Attribution - Sources - licenses