Deafness or difficulty in hearing or hearing impairment is a medical disorder in which an individual suffers from partial or total inability to hear. Aging and chronic exposure to loud noises are some of the significant factors that contribute to the hearing loss.

Hearing loss do generally affects people of higher ages. About 25 percent of people in the world ageing between of 55 and 64 have some degree of hearing difficulty. For those older than 65, the number of people with some hearing impairment is almost 1 in 2.