NEW YORK—Veteran daytime talk show host Maury Povich is retiring, with the last original episodes of “Maury” set for broadcast in September after 31 years on the air. NBC Universal confirmed the impending exit of the 83-year-old Povich on Monday. Old episodes are likely to live on in some form, however, with the company saying that “the show has thousands of lively, entertaining and dramatic episodes that will continue to be successful in daytime for years to come.” His show hit upon a successful formula many years ago and has stuck with it: using tests to reveal, on the air, the father of babies where paternity is in question or lie detectors to see if a spouse is cheating or not. It wasn’t highbrow entertainment but was popular enough for Povich to build a devoted audience among viewers young enough to be his grandchildren. Povich was a television journalist before …