Though the occurrence of overactive bladder is prevalent among those 65 and older, OAB is not necessarily a normal part of aging. About 16% of Americans over the age of 40 and about 30% over the age of 65 have OAB. There is a wide range of ailments and related conditions that can cause an overactive bladder or urinary incontinence. If you or someone you know may have an overactive bladder, see a doctor to learn ways on how to manage OAB symptoms.