The O.C. was one of the staple teen dramas of the aughts, partly thanks to its iconic cast, including names like Mischa Barton. It takes place in Orange County (The O.C.) in Southern California and ran for four seasons before the network canceled it. The show’s catalyst was when Ryan Atwood, a troubled teenager from a broken home in Chino, moved in with the Cohens, a wealthy family living in an upper-class community in Newport Beach. Ryan and the Cohens, which included Sandy, Kirsten, and Seth, came from different worlds, but they eventually learned how to operate as a unit.

https://screenrant.com/the-oc-cast-ages/