I have it since I can remember, but got aggravated by two events:
(1) One time when I was going to setup the drums to play for a band, walked front of a tall speaker and precisely when I stepped in front of it a loud boom scaped from it; and
(2) covid-19.
It's kind of in "stereo", in the right ear is a bit louder and with a higher pitch than in the left ear. I can't imagine how terrible it is for people with worse cases but in my case I can live with it despite sometimes I have trouble hearing some stuff - but it's kind of uncanny sometimes I even forget about it until I remember I have it, like now reading "tinnitus" in the title of this article. Something like the yawn effect.