I also have had tinnitus for about as long as I can remember, at least by about 10 years old when I became aware of it. I was never exposed to any loud noises, and passed every hearing test, except that I was missing one particular frequency. I lived in a very, very quiet place, I assumed, and still think maybe my brain was trying to put sound where sound didn't exist. these days going to try aural rehabilitation and see if that works for me,