The body of a 79-year-old man who went missing after entering Lake Hopatcong in Roxbury on Saturday evening was recovered Monday morning, authorities said. The man, a Landing resident, was found after an extensive search that started after he went in the water at about 7:30 p.m. and didn’t return, the Morris County Prosecutor’s Office said Monday. He was not identified pending family notifications, but the man’s death is not considered suspicious. A search for the man was launched Saturday night before being suspended overnight. It resumed Sunday but water conditions and poor visibility made i…