What are the different types of dementia in an elderly population?

Dementia in Elderly. 1. Senile dementia 2. Alzheimer's dementia 3. Post stroke dementia 4. Vitamin B12 deficiency demntia 5. Alcoholic encephalopthy dementia and others...
The most common. Is alzheimer's followed by lewy body dementia. There is also vascular dementia, mixed dementia, parkinson's dementia, frontotemporal dementia and others.