I am 76 years old. Excellent health. As I've aged, my high frequency hearing has slowly gotten worse and is now degraded to the point that I have trouble understanding speech in noisy environments. What interests me is the following: if I hold my nose and blow to build up pressure to the point where one or both ears "pop", I notice a brief but significant improvement in my high frequency hearing. If I do this experiment when in the shower, my hearing of the high frequency sound of the running water improves dramatically but the effect lasts only about a second. Does what I've described give you a clue as to what I can do to improve my high frequency hearing on a continuing basis?