Maybe/ yes. It depends on the type of dementia. Cerebrovascular risk factors can be changed thus preventing the onset of vascular dementia. The other dementias, which follow a pattern of genetic expression, such as alzheimers, lewy body disease, and picks disease, will invariably manifest themselves eventually. Aricept, exelon, (rivastigmine) and razadyne in combination with Namenda can slow down the process of alzheimer's.