Age-related hearing loss, or presbycusis, is the slow loss of hearing that occurs as people get older.
Tiny hair cells inside your inner ear help you hear. They pick up sound waves and change them into the nerve signals that the brain interprets as sound. Hearing loss occurs when the tiny hair cells are damaged or die. The hair cells do not regrow, so most hearing loss caused by hair cell damage is permanent.
There is no known single cause of age-related hearing loss. Most commonly, it is caused by changes in the inner ear that occur as you grow older. Your genes and loud noise (such as from rock concerts or music headphones) may play a large role.
Some factors contribute to age-related hearing loss (family history, repeated exposure to loud noises, certain medicines etc.)
Loss of hearing often occurs slowly over time.
Symptoms include difficulty hearing people around you, problems hearing in noisy areas, more difficulty understanding people with higher-pitched voices etc.
There is no cure for age-related hearing loss. Treatment is focused on improving your everyday function, among other things, hearing aids can be useful.
Not sure of your hearing ?
You can consult an ear, nose, and throat doctor and make hearing test to determine the extent of hearing loss.
Source : MedlinePlus.
More info on age-related hearing loss : http://www.nlm.nih.gov/medlineplus/ency/article/001045.htm