Yesterday I had a hearing test and all is well, except I have a very slight loss at the highest tones in one ear. This means I've either suffered some minor nerve damage along the way, or my mind was wandering during part of the test.
Either scenario is extremely plausible.
I worked for a few years in an environment where very loud noises were common place and we didn't really have adequate hearing protection. This, I think, was one of the benefits of not having a union.
Also my mind wanders all the time. So, who knows.