Graham Nash feels optimistic that young people will once again change America for the better. So while he’s frustrated by political ideals surrounding issues like global warming and marriage equality, he realizes that “those powers against progress” will naturally run their course. “They will all die at one point and the children will take over,” Nash said. Then he added: “Do you know anybody under 25 that gives a damn whether you marry a man if you’re a man or if you marry a woman if you’re a woman? No.” …