After more than 20 years hosting the best of late-night television, Jay Leno steps off “The Tonight Show” stage in Burbank, Calif., for the final time Thursday night. Tonight, Leno, 63, offers his second goodbye. Once again, he’s giving up the Tonight Show to a younger host 39-year-old Jimmy Fallon, who starts Feb. 17. We wish the both of them the best of luck!