Rob Halford Talks Judas Priest Farewell Tour

"I suppose retirement or slowing down, if you want to call it that, I don't know," he said. "I think you have to face mortality, that's for sure. Some bands keep going and going, some bands ease off a bit, and some bands stop altogether. It happens to all bands, eventually, and now this is something we're facing in Judas Priest. So, what we want to do is leave on what we feel are respectable terms, musically."

Although Priest is still very popular around the world and performing well, Halford said the band are in danger of "Muhammad Ali Syndrome."