Longtime Colombo under-boss John “Sonny” Franzese is the living embodiment of the ultimate mob rule — bragging in an interview about refusing to rat despite it making him the oldest federal prisoner at the age of 100. Wheelchair-bound Franzese, now 102 and living in a nursing home, told Newsday about his life of crime — and how he stuck to the “Goodfellas” adage of “Never rat on your friends, and always keep your mouth shut” despite facing 50 years behind bars.