Tom Selleck, former star of "Magnum P.I." and current star of A Thousand Clowns, may not look 100, but that's how many times he's played Murray Burns since the revival kicked off in Boston this spring. Selleck poses with his wife Gillian Mack and 2001 Tony Award winner Christine Ebersole (42nd Street). In A Thousand Clowns, Selleck stars as the iconoclastic, slovenly and free spirited Murray Burns. An unemployed TV writer, Burns struggles to raise his nephew Nick (Nicolas King) just the way he wants, without interference from his friends, neighbors and the pretty social worker (Sandra Markowitz) assigned to his case. A Thousand Clowns runs at the Longacre Theatre through Oct. 14.