The "age" of a Joker-themed ride depends on which Six Flags park you are visiting, as there are several different coasters bearing this name. The most famous version, The Joker at Six Flags Discovery Kingdom in California, opened in 2016. This ride is a "hybrid" coaster, meaning it was converted from an old wooden track (Roar) into a modern steel-on-wood masterpiece by Rocky Mountain Construction (RMC). Another popular version is the "4D Free Fly" coaster named The Joker, which first debuted at Six Flags Great Adventure in New Jersey also in 2016, with identical versions opening at Six Flags Over Texas and Six Flags Great America in 2017. These 4D coasters are known for having seats that flip independently of the track. If you are referring to the Joker's Jinx at Six Flags America in Maryland, that attraction is much older, having opened in 1999. Because Six Flags frequently re-uses DC Comics themes, "The Joker" has become one of the most prolific names in their portfolio, representing a variety of ride technologies from the late 90s to the present day.