Regis Philbin, who is 79, announced this morning on Live! With Regis and Kelly that after a 28-year run, he plans to retire from hosting the morning talk show at the end of this summer. “This will be my last year on this show,” he said. “It was the biggest thrill of my life. There is a time that everything must come to an end for certain people on camera, especially certain old people.” Can you imagine how happy Kelly Ripa (who’s about to celebrate her 10th anniversary on the show), is right now? Or how vulnerable poor Gelman must be feeling? More importantly: Who do you think they’ll find who’s old and cantankerous enough to fill his shoes? We hear that Larry King is looking…