(I see you use another quoting style, so I'll try to keep my language to the point) I only heard about the term tinnitus as a 'teen or perhaps later.
ENT: Ear, Nose and Throat - a medical specialism.
My earliest memories are from around 18 months. I used to have very bad earache whenever I had a cold or influenza. My mother told me that I used to burst into tears, unprovoked or without any of the usual baby related reasons and eventually around age five or six I was diagnosed with "glue ear".
The way it was explained to me was: my eustacian tubes were too narrow. Speaking to children: "Your ears, nose and throat are all linked together and the tubes that link your ears to the rest of you are too small and get blocked easily".
I had surgery to insert "grommets" into my eustacian tubes. This was done twice. Grommets are tiny plastic, hollow tubes. From memory: about 3mm long and 3mm outer diameter but that is from a long time ago.
Now here is where it gets complicated! My dad was in the British army (so was my mum but that's another story). This means we moved house every two years or so. I can fix dates quite well.
The first operation was performed in Rinteln, West Germany at a British Forces hospital. We were stationed in Paderborn so it would be around 1976. I had a second set inserted in Wythenshawe Hospital in Manchester (UK) in 1977 or perhaps early 1978.
I know that the second set of grommets were removed by a doctor (I think an ENT specialist) but I can't remember if the first set were removed in Manchester and replaced by the second pair at the same time.
I recall that the doctor used a black, plastic, bell shaped thing that fitted over my ear and wiggled some sort of hooked, metal probe within my ear to pull out the grommets. It was quite painful.
Even after the operations, I still got earache whenever I had a cold up until around age 20-25. That age range is a bit hard to pin down. I'll also note that when we were stationed in Cyprus in 1986-7ish, a lot of swimming and diving helped clear the tubes!
One of the nasty side effects of glue ear is that you have trouble with pressure changes. Airliners and swimming are the bane of your life.
There are some notes. Hope it helps.