Most commonly age related hearing loss affects both ears equally. However, some factors can cause hearing loss in one or both ears. For example, age related hearing loss may be worsened by noise induced hearing loss from loud sounds due to weapons exposure. In addition, depending on the handedness of the shooter, one ear may have more hearing loss than the other. However, sudden hearing loss needs medical treatment. If you experience a sudden change in hearing, you'll want to reach out to your physician or an ENT specialist to receive timely treatment.