@aba @julieo4 I am now 84 yrs old.. but when I was 19 and aboard a US Navy ship, a 5" gun was fired close to where I was standing on deck.. while my ears rang for a few hours... I thought I was indestructible in those days..
10+years after that event my hearing was noticeably not as good as it once was... A respected hearing doctor said that I had the symptoms of someone who had hearing loss caused by an explosion or very loud noise.. He explained that the tiny hair like sensing parts within my middle ear should be usually standing up... but unfortunately mine in that left ear (closest to that 5" gun fire) were lying flat... and could not sense the vibrations sent from the ear drum through those bones in the middle ear.. The Hearing in that left ear never got better.... when not subjected to that big noise..
My right ear just compensated for the left ear's lack of hearing.. The VA gives me hearing aids... as the hearing in my right ear is not very good for the last 20 yrs or so.. I have the hearing aids where the left one just sends what it hears to the right ear for mixing with what is heard from the right side... That is very helpful when riding in a car someone else is driving..