Dementia is one of major problem worldwide, and leading to great social and economic expense for medical and family care. Many of medical treatments have been introduced and performed to deal with this devastating disease but none could be publicized as clear evidence related with cure of dementia. Recently, it was reported that physical exercise could be useful approach to delay or prevent dementia. According to the recent Cochrane review of 16 previous literatures, exercise programs showed positive effect on the ability of performing daily activities and cognition in people with dementia. To help understanding of exercise therapy for dementia, in this review, the effect of exercise on recognition ability according to aging was investigated through the previous published papers and the proper exercise program was introduced for patients with dementia.