Arnold Schwarzenegger’s youngest son, Joseph Baena, is officially a 24-year-old.The actor took to Twitter on Saturday, October 2 to share a collection of photos of him with his son: one of him sharing a drink with Baena, a picture of them riding bicycles, and another in which they posed in front of a mural depicting the action star back in his bodybuilding days. In his caption, Arnold praised his son and complimented him on all of his personal and business endeavors.