I'm 62 and have had tinnitus for a while now. It got noticeably louder the last few years. Before that, it was noticeable, but not annoying. Now, sometimes it is annoying. For me, it is high pitched, relatively constant pure tone ringing, equally in both ears. It doesn't really seem to mask other sounds, and I just remind myself that it is not a physical sensation and therefore can be safely ignored. Seems to work for me. Most times I can completely ignore it. I typically sleep with crickets, cicadas, or frogs chirping in the background (a soundtrack, now that I live in AK where none of those things are. It was great growing up in the South where the cicadas were deafening!). I've always protected my hearing from a young age, and actually still have very good, above-age-average hearing. I use hearing protection religiously, still, and always have them at the ready at movies if they get too loud (which is not as often as it used to be). I have, on 2 occasions, on hunts, fired a large caliber rifle without protection, which was incredibly painful (and stupid). I'm certain that exacerbated the tinnitus. I read a study where people with tinnitus were given specially created music that had been processed with notch filters for the frequency (-ies) prevalent in their tinnitus, which (they theorized) led the brain to learn how to ignore it. I thought I might try to determine my frequencies and remix some of my music collection that way to see if it helps.
I've also noticed that when I tighten my neck muscles, you know, like when you fake being really mad, that my tinnitus actually increases in volume while doing so. It immediately returns to "normal" when I relax. This has led me to believe that, although tinnitus may be a neurological or brain-created phenomenon, there appears to be some physical connection to it, given that flexing muscles changes its intensity. I'd be really interested to know if anyone else has experienced this, or can reproduce it. If you don't know what I mean, think a teeth-gritting, wide, fake grin with a little head trembling thrown in. Please let me know.