Common age for otosclerosis is:

50% of patients of otosclerosis have positive family history.Females are more commonly affected than males. Whites are affected more than negroes.Age = most common between 20-30 years and is rare before 10 and after 40 years.Deafness is increased by pregnancy, menopause, trauma and major operations.Viruses like measles virus have also been associated with it.