Corey "Big Hoss" Harrison was 27 years old when he was arrested on March 23, 2011 for battery and resisting arrest over a barroom incident in San Bernardino County, so we suspect he is 28 or 29 at this time. Corey has worked at the World Famous Gold & Silver Pawn Shop since he was a child.
The first season of Pawn Stars aired in 2009. The show revolves around the Harrison family : Rick Harrison, Corey's father; Richard (Rick) Kevin Harrison, Corey's grandfather; and Corey himself. Corey's childhood friend, Austin "Chumlee" Russell also adds fun to the mix.
Pawn Stars Season 6 premiered on November 5, 2012. The nickname "Big Hoss" may be outdated as Corey discusses his extensive weight loss in the video below: