Regis Philbin, 79, announced Tuesday on his show “Live with Regis and Kelly” thathe’s retiring by the end of the summer. “It’s been a long time,” Philbin said during taping yesterday to a shocked co-host and audience. “It’s been 28 years since I’ve been here (before the show was called “Live with Regis and Kathie Lee”). “Everything must come to an end for certain people on camera, especially certain old people.”Take a look at Regis and Kelly in action: