Healthcare World Alzehimer's Day 2020: Let's talk about dementia Updated : September 21, 2020 05:56 PM IST Dementia mainly affects older people; however, it is not a normal part of growing old. Alzheimer's disease is the most common form of dementia, and it contributes to 60-70% of cases. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.