Arnold Schwarzenegger took to social media on Saturday in order to wish his youngest son, Joseph Baena, a happy 24th birthday. The "Terminator" actor shared a collection of three photos on his Twitter that showed him sharing a drink with Baena, cycling with him and another in which they posed in front of a mural depicting the action star in his bodybuilding days.The father’s heartfelt post came along with a caption in which he praised his son for his numerous career endeavors. "Happy birthday