This is interesting. My grandmother developed dementia roughly 10 yrs ago. We live in a predominantly Asian neighborhood, and she speaks Spanish. She doesn't speak English at all. So she stayed in the house mostly and did rarely went out on walks. She used to drink black tea every day while living with us. I know that there isn't as much caffeine in black tea as in coffee but I'd like to think that it may have helped her retain quite a bit. If anything the routine helped her. I would say that if there's any chance of stopping or slowing down the development of dementia, then I would go for it. Thanks for posting this.