Have your hearing professionally tested.
It couldn't be easier to have a hearing test done. Simply find an audiologist, ENT, physician or dispenser at a wholesale club, university hospital, VA clinic or call the National Hearing Test and have a hearing test done right over your home phone. (OK, maybe it could be a LITTLE easier, but seriously... as these things go, it's pretty simple.)
The National Hearing Test is an inexpensive and private service that provides an accurate, calibrated hearing screening test, developed with funding from the National Institutes of Health.