I am not yet 50 but recently went to an audiologist to get my hearing tested, I recommend that to everyone. I confirmed what I had already suspected, I lost the ability to hear high frequencies, I top out at about 16khz. Now I pay little attention to equipment that does not hit 20khz of has "rolled off" highs, I can't hear them anyway. He did say my hearing was very sharp though, able to hear as quiet as 5db.
