I began to notice tinnitus over past few years in one ear after 20+ years flying. Only went to own doc after I really began to notice it in the quiet of the night. Sent me for a CAT scan to check if any underlying cause, but all ok. Doc said that normally it doesnt get worse with age, so can relax about Medical.
Have always worn my own sound damping headset regardless of aircraft type, so am happy that it isnt worse. Since I got it checked & no need to worry about Licence or getting worse, I cant remember when I last heard it!
(The more you think about it the more you hear it - bit of a positive feedback loop!) Hope this helps.