Tim Gray Senior Vice PresidentWhen the 20th annual Movies for Grownups Awards air March 28 on PBS, the winners will include career achievement honoree George Clooney, who turns 60 this year and whom AARP exec Tim Appelo described as “a slam dunk argument against ageism.”Hoda Kotb will host the event on “Great Performances,” the fourth time that the annual awards have aired, always on PBS.The winners were announced March 4.