Bruce Springsteen wrote sadder songs than “Glory Days,” one of the final tracks from his 1984 masterpiece Born in the U.S.A., but perhaps none of the Boss’s songs more effectively examines the feeling of being someone who used to be. It might be the most tragic song ever written in a major key, built around a honky-tonk piano and garage band guitar sounds, and meant to be sung with a smile on your face. The pathos of the song—that whether you were a great athlete, a great beauty, or a world-famous rock star in your youth, obsolescence awaits us all—is both undeniably true and incredibly grim. Which, we suppose, makes it a fitting inspiration for the title of Johnny Manziel’s forthcoming interview show, Glory Daze,…