OK, it’s really, truly, finally official: A Prairie Home Companion host Garrison Keillor is indeed retiring. That’s what he tells the New York Times, anyway. “In order to have some say about this and in order to maneuver this, I should do this sooner rather than later,” he says in today’s (May 13) story. “One should not wait for the very last minute, when one has become a pitiful hulk shambling on and off stage exciting the sympathy of the audience. I don’t want to come to that point.” When Keillor told the AARP Bulletin in March that he was leaving, Minnesota Public Radio chief Bill Kling, who brought Prairie Home into national distribution, downplayed the announcement as a publicity stunt.