It is cumulative. Each time, no real worry. Over 20 years it just happens. I noticed one day when listening to some signals. Levels, at some frequencies wer

It is cumulative. Each time, no real worry. Over 20 years it just happens. I noticed one day when listening to some signals. Levels, at some frequencies were different. Again, minor league. But, due to a few decades driving window down, it all did add up to a little something. Overall in my life, apart from that window business, I have taken good care. The highs are rolling off some now. Normal. Discrimination is still really good. But, I can now tell left ear from right. Thanks for the tip. I will have to get a set. So, you have to decide what is worth what. At my peak, I could hear well through 22khz. Today, I still hear very well, but range has dropped. 17khz or so. I do not care much. Discrimination, sensitivity related to things under 12khz is where all the good stuff is. Mostly normal aging. I have no worries. I can still often tell you who made a vintage watch by the sounds it makes. Music is still great! With a ton of work, I could have preserved more sensitivity, and a bit of range. But I have lived well too. You must evaluate these things and act or not, now. Hopefully, you have no worries aging up too.